She and the male are not fixed the male is getting fixed soon. I do not think she has gone into heat yet, so she might be soon then. I can see if I can bring her to the vet.
Even if you get your male fixed, some other male could come visiting.
So if you do not want her to have kittens, I strongly recommend that she be spayed as soon as possible. Especially with spring coming, which is the time when many animals tend to get pregnant and have babies.