i feel that you should ask your boyfriend to get you a pregnancy test since you both were responsable on having sex. you just may be pregnant and if you are your mom will find out your not a virgin, but what i would be worried about, is the baby, not that your not a virgin anymore, the baby is important now. so you must think poperly and make a mature decision. this is a sitiuation you can not run from. i am not trying to be harsh but there really is no other way to discuss this with you. i would get someone to help with resources if i was in your situation, take a test, you can do it in the privacy in your home and then after the results you and your partner can think on what you two want and then you may let your mom know. right now you just need good resources and support.