She is a holland lop and I showed her the first time and got champion and she hasn’t since then. I got my buck from a show breeder.
What kind of show did you show her in? ARBA shows do not include "champion" as anything you could win at a show - the best you could possibly do would be Best of Breed (or, if you have an astonishingly good animal, Best in Show). And honestly, as popular and competitive as Holland Lops are, I find it pretty hard to believe that a newby owner/breeder could bring a rabbit to an ARBA show and win BOB - the competition is just so fierce. I hope you don't discourage easily, because it generally takes a lot of work and knowledge (and a certain amount of sheer luck) to get those sorts of awards in the really popular breeds. You need to learn how to look at a rabbit and be able to say, "this is where this rabbit is good, this is where it needs some improvement," and breed it to another rabbit that at least doesn't have the same weaknesses, and then hope that at least once in a while, you get a baby with all of its parents' strengths. Some folks are at it for years before they get there.
Old human pregnancy testing used to be done on rabbits.
According to Wikipedia, it also used to be done on frogs, and mice.

And, believe it or not, a very popular hormone replacement for post-menopausal women is extracted from
pregnant
mare ur
ine. There isn't a whole lot of similarity between horses and people, but there is enough similarity in the hormones that some folks assume that you can use human pregnancy tests to check for pregnancy in horses - which you can't.
Not all dwarf breeds actually inherit dwarfism and there's always a small chance that the hips wont fuse. But holland lops are a breed with dwarfism which is the critical factor in fused hip bones. Also be aware that you will have a high incidence of dead and deformed kits working in this breed because dwarfism is homozygous lethal.
Please, please,
please, can we take this piece of misinformation out, shoot it, and bury it once and for all? Rabbits' hip bones don't fuse; that's a problem with Guinea Pigs (which are not even lagomorphs, but a type of rodent). I don't know why this piece of misinformation has more lives than a cat, but it doesn't happen, not is
any size breed. I have no idea who first made the mistake of this cross-species confusion, but it isn't true, no matter how many times you may read it on the internet.
Now, as to the matter of dwarfism in rabbits . . . . It is true, the Holland Lop is a dwarf breed. Rabbits with the dwarfing gene are a little smaller, and have shorter ears, limbs, bodies and faces than rabbits without the dwarfing gene. Hollands Lops without the dwarfing gene will weigh half a pound to a pound more than Hollands that have it, and will almost always be over showable weight.
The dwarfing gene is what is known as a
dominant gene - which simply means that, if a rabbit inherits even one copy of it, you will be able to tell that it has it, just by looking at the animal's appearance. Unfortunately, it is also a lethal gene - meaning that, if a bunny is so unfortunate as to inherit a copy of it from both parents, it will die. Sometimes these "double dwarfs" (often called "peanuts") die at birth, sometimes they live for a couple of days, but their digestive systems are not complete, so they don't survive for long.
A Holland Lop that is showable size has one copy of the dwarfing gene, and one of the normal growth gene. Breed two such animals together, and each baby has a 1-in-4 chance of getting the dwarfing gene from both parents, and dying as a result. That's NOT the same thing as saying "one out of four babies will be peanuts." In an average Holland litter of, say, 4 or 5 babies, you might not get any peanuts, or you may get one or two . . . actually, you could even get a litter of
all peanuts, but I've never been that unlucky. A sample group as small as one litter, or even all the babies a pair may produce in their lifetimes, is just too small for the numbers to mean anything. Suffice it to say that you are bound to get
some peanuts, if you do dwarf-to-dwarf breedings (as an example, I had 3 Netherland Dwarf does kindle litters in the last couple of months, for a total of 10 babies, of which only one was a peanut. 2 died at birth due to their mother's stupidity, but they weren't peanuts).
In addition to the risk of peanuts, there is the other thing I have touched on - the babies that don't inherit a copy of the dwarfing gene from
either parent, and wind up with two copies of the normal growth gene. Some people call these "false dwarfs," or "brood does" (I know one person who refers to them as "Big Ugly Does"). They aren't showable, due to the fact that they are almost always oversized. False dwarf bucks are almost always sold as pets, though some breeders will hang on to false dwarf does that have reasonably good type. Being slightly larger, they generally average a few more babies per litter, they hardly ever have kindling problems, and they never have peanuts (which can be a real bonus to anyone who has a problem with the idea of having something born that can't survive).
And no, rabbits do not go into heat. Other than both being mammals, rabbits' reproductive systems really aren't much like a human's at all - for one thing, rabbits are induced ovulators. They do have hormonal fluctuations that are tied to the ripening of eggs, which make them more fertile at some times than others. Before attempting to breed the doe, check the color of her vulva. A cherry red color (or as near it as she gets; some does never get that red) indicates a hormonal peak and fresh eggs. Purple indicates that she has passed the peak; while she may breed, the eggs are aging, and she may not have as large a litter as she might if she was bred at her peak. A doe that shows light pink is probably not going to breed, or conceive a litter if she does.