Bed bugs??????

Apparently my sister had gotten bed bugs, so my mom decided to get her a new mattress. I told her that wasn't going to get rid of them, but of course she didn't take my word for it. Couple months go by and I finally start to get bed bug symptoms. My daughter and I were both getting bit, but my bf wasn't so he thought I was just being delusional. I passed it off as some "skin condition" that some people get during pregnancy (forgot what, but it starts with a p). It seemed legit, so I ignored my daughter's bites bc they didn't look like mine. Until finnnnallllly, I seen one crawling on my pillow!!! Idk wtf to do! I'm pregnant and can only treat what's in my own room, as I can't control what goes on in my sister & parents room. UGHHHH I wanna move out sooo baddd, but I'm due so soon and not financially fit for that right now.

How did you guys successfully get rid of these nasty lil things??? How long did it take you? HELLPPPP!!!