From one bad situation to another

So my boyfriend moved in with me about a month ago and weve been having problems because of him drinking. Skipping the details. We got into a fight so. I decided I needed a break and left to my sisters house (45 mins away)

After I get here I feel great. I’m finally getting the break I needed. They just bought a house together and are a lot older than me. I’m 18 and 8 months pregnant. Her fiancé had been drinking a lot little bit but didn’t seem any kind of way bad.

We are all sitting in the bed talking and he started touching my legs, like rubbing up and down them and touching my feet. I tried not feel weird because my sister is sitting there and acting normal about it ??

My sister is a teacher and had to work in the morning, which I hadn’t even thought about because who would think anything weird of it? Well, she decided to go to bed and me and her fiancé continue playing computer games. Which I already felt weird about because im paranoid.

He instantly starts trying to rub my back and touch my stomach. Like put his hands in my shirt to touch my stomach. Im like ??? What are you doing. He instantly acts like he’s not doing anything weird and things go back to normal.

After that I just start planning on going to sleep with my sister. He then tells me how I need to leave my boyfriend and how I can live here and that he makes ‘a lot of money’ and just how incredible it is that I’m pregnant. ( my sister miscarried a year ago and they haven’t tried since). I feel really uncomfortable because I have a home and I find it rude he thinks I can not be so irresponsible and consider that. I tell him I’m going to bed and he asks me to watch a movie with him, which i say no to.

Idk how to feel about any of this, but I think my sister decided to call in today, THANK GOD. I was literally begging and was goi by to pay someone to come get me. I don’t wanna tell her because I don’t feel like she’d believe me, and I don’t wanna make them have problems. They just bought this house together, and I didn’t let anything happen. But I feel scared being here if she would have went to work. What do I do?