Pregnant and feeling so alone

I just found out that I’m pregnant, like maybe 5-7 weeks, I haven’t gone to the doctor yet and the timing couldn’t possibly be worse. First of all, I don’t even know how I got pregnant or when, because I had a nexplanon implant that I had removed about a month and half ago, but then started on pills 4 weeks ago, and with that 2ish week in between, I was on my period so.....wtf. Anyways, I’m 18 and about to go to college next week, I’m supposed to be moving across the country and living in the dorms. I have already put my notice in with my job and packed and I’m making my rounds with my friends to see them for the final time, and I finally decided to add all my coworker friends on my social media’s since I’m leaving work.

I will admit, this hasn’t been the brightest move for me, but I have been sleeping with my coworker since the beginning of the year in a casual fwb relationship, but we’ve slowed it down recently because he got promoted and is now my superior. And yes, I’m 100% sure I’m pregnant by him, I haven’t been with anyone else since last year. Apparently, yesterday was national girlfriends day, and when I finally put him on my social media, he had posted her with some long winded post about how much he loves and cares for her, how much he appreciates her and all that. We haven’t done anything in about 2 weeks, so I thought maybe it’s some sappy new relationship, but no, the photo was from 2 months ago!!!

And ofc I do some searching because I have his social medias now, only to find out that they’ve been together for 4-5 months, since before we even graduated. But I’ve been sleeping with him the whole time, and now I’m pregnant. So I don’t even know what to do because he’s staying here to work at our job, and I’m supposed to leave, but on top of me being pregnant, he’s got some girlfriend. And I don’t even think he thought about those posts, like I’m not sure he knows I know about her. My feelings are so hurt by all of that, not because he has a girlfriend, but because he chose to keep seeing me after they got together.

And to make a stressful situation even more stressful, I showed my mom my best friends gender reveal for her baby, and it lead my mom into a whole rant about how we better not have kids or bring any children into the house until she’s 59, she’s 37 now, and how she isn’t helping and how we’re completely on our own. Now, my mom had me and all my siblings by the time she was 23, me when she was 19 so she knows the struggle of being married and having kids young, but I was hoping she’d be more understanding. I haven’t told her yet, and at this point I don’t think I’m going to, because she could pull me from school, she could kick me out, cut off my finances and my family, idk but it’s made me so worried sick about the whole situation.

I’m not here asking for pity, or wanting to be shamed, I made my bed, so I’ll take what I’m given, but what am I supposed to do in this situation. The father of my kid has a gf and has been cheating on her, and going to him for help could end really badly because of it, my mom has made it abundantly clear she’s in no way wanting to help me, my friends who I’ve told are supportive but they can only provide some emotional support, which is still appreciated but still.

Should I go to the girlfriend privately and let her know he’s been cheating, and leave out the pregnancy part? Should I go to him directly and tell him I know about the cheating, and tell him the pregnancy part? Should I tell my mom and hope for the best? Or maybe should I just move and deal with it across the country by myself? Idk. Thank you for reading this series of unfortunate events that are currently plaguing my life.