MIL only likes me because I’m pregnant

So I’ve been with my bf since last May. In September I lost my place because my roommate lost her job and we couldn’t pay rent. My bf moved me into his house but kinda on the DL. He didn’t tell his mom I was living there. They found out when I was always there every night. But my mom took in foster kids so my room was gone and I needed a place.

I could tell his family wasn’t feeling me. I’ll admit they had their reasons. I don’t really talk to them much or at all, but they don’t talk to me either. I only talk to his mom now since we actually have something to talk about my baby. But she didn’t like me cause she felt I was possessive and I did get really upset with my bf once and slapped him and his mom was home I’m not proud. Basically she would tell my bf I was bad for him and the death of him.

Fast forward 3 months we announced we were 10 weeks pregnant and his mom since then has been like a whole new person. I’m now 7 months about to be 8.

She talks to me all the time. She’s always cooking for me. My bf says she’s always asking about me and the baby. I still don’t talk to anyone else who lives there I guess they still don’t like me or know me. But am I wrong to think she only likes me now because I’m pregnant? This is her first grandchild and all she’s wanted was a grandchild.

Like before she knew I was pregnant I could tell she didn’t want me and her son together. She was never disrespectful or rude. She’d make small talk. But I could tell she didn’t like that I hit her son or came off possessive at times (I’m young and just wanted to know where he was. I’ve been cheated on before so my fear took over) maybe she was upset that I just moved in and didn’t get permission but my bf said I could🤷🏻‍♀️. Also on thanksgiving she had a meltdown on how we disrespect her by taking showers together. But now that I’m pregnant she doesn’t seem to care.

So is she only nice because of the baby? Or is she finally coming around? I don’t want to be used for my uterus or anything. Our relationship doesn’t go beyond talking about the baby she’ll ask about my family sometimes. Even if she’s asking if I ate I know it’s because I need to eat for the baby. If she is only accepting me because I’m pregnant should I be offended? Or does it really matter how we came to build a relationship just that we have one is important? Anyone else had a rough start with their MIL?

(ALSO, I know she’s not my real mother in law since I’m not married to her son but I rather say MIL than my boyfriends mother.)

I’m 21 btw

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