GMO means "genetically modified organism." Eating something that has been genetically modified does NOT cause either cancer or birth defects. For once, I would like to read a rational analysis of the situation; anything you can find by googling "GMO birth defects" or "GMO cancers" is going to be a lot of hysterical fearmongering intended to do exactly what it has done to the OP, reduce you to a state of abject terror. The authors of such drivel are not trying to inform you, they are trying to scare you. It's sensationalist nonsense, written by someone with their own agenda and based on the very shakiest imitation of science if not outright fabrication.
In the court of public opinion, you don't have to provide hard facts; speculation and innuendo get picked up and waved around as though they actually mean something. People with no knowledge repeat what they've heard, and the story grows. Glyphosate has been in use for 40 years. It was introduced shortly after DDT was banned; there were many hoops that a manufacturer had to jump through to demonstrate that any product was effective and would also have no lasting environmental effects. Tests were done where animals were continuously exposed to various levels of the product for 2 and 3 generations, and no signs of genetic changes were noted.
Am I saying that glyphosate is 100% safe? Of course not - I haven't done the experiments myself, and I know that the scientific method doesn't work in absolutes. But if product label directions have been followed, there shouldn't be any detectable residue from the pesticide left by the time the crop is harvested. Unless the intended mother-to-be is drinking the stuff or bathing in spray solution, she isn't getting significant exposure to glyphosate. Like most modern pesticides, it breaks down fairly quickly after it has been applied.
My advice to the OP is, stop reading this junk, for the sake of your own peace of mind. I understand that you want to be informed, but these people aren't interested in informing you. They have gotten you all bent out of shape about something that really doesn't affect either you or your animals. If you don't want to be exposed to glyphosate, don't spray it in your yard, but don't worry about it being in your food because it isn't there anyway.