Why does my boyfriend's mom hate me?

My boyfriends mom hates me!!! We have been dating for almost a year and a half. at first she really liked me until we hit the one year mark. she began to be mean to me and stopped talking to me. She says she just doesn't like that me and my boyfriend are getting so close. But what are we suppose to do, were not allowed to go out anywhere, to party, nothing and if we do he has to take me home right after. I don't understand why she hates me. I've never disrespecter her , her home, or her son (my boyfriend). I've treated her with nothing but respect. Please help me Christmas is coming up and so in New Years and he wants me to go to his house but I told him I didn't want to go over any longer because I don't want the akwardness.
We are also trying to get pregnant at this time... could it be that she knows or can sense it and thats what shes acting like that?

Please Help!!

You feel his mom hates you, and your trying to get pregnant? Not the smartest move! Is there a reason why you want to bring a baby into the picture at your age, and knowing how his mom feels? You wont be winning any points with her on that one!

Well why do you want to get pregnant??
how old are you exactly?

I think that she's worried that you guys are too young to have sex. I saw your profile, so you must be 16-18. It sounds kind of young.

'cause she thinks that you're trying to take her little boy away from her! that mom needs to suck it up.