At this point, there’s no way to ascertain if she’s pregnant right now– it is possible since it only takes 3 seconds for a male to impregnate a female, and I believe 4mo is a viable age of pregnancy for a female. You should assume that she may be pregnant, so please monitor her behavior moving forward and when signs seem to show, book a vet appointment to get some informed guidance and assessment on her. … at 4mo, his sperm may not be super fertile/reliable, so that works in your favor that she may not be pregnant, but ultimiately the possibility still exists for a litter.

Please read through the following links thoroughly and I highly recommend you speak bluntly with your parents that this may be a possibility and they too need to be aware of monitoring for signs and how to keep the babies (if she is pregnant and she has the litter successfully, you cannot separate the babies from her until they are weaned, so temporary arrangements for several weeks are still needed before any rehoming can occur): https://wabbitwiki.com/wiki/Pregnant_rabbits , https://flashsplace.webs.com/accidentallitters.htm

Since BinkyBunny prohibits the topic of intentional breeding, not many users have kit care/pregnancy experience; therefore, the resources above will likely be more helpful than us.

Have the male’s testicles dropped? At 4 months, she technically could be spayed (and yes could have gotten pregnant). The best thing is to talk to your vet about what happened. They can determine if she got pregnant and do an emergency spay.

Some vets will spay at 4 months, but others prefer to wait until 6 months.