possiable pregnant

So for about 2 weeks I've been feeling like puking, according to this app my prd should've been here, it's been arrucate since I've gotten this app 5 months ago, I have been having sex, I also had a missing 7 months ago, I have an almost 2 year old, my bf and I are no longer together bc I found out he had been messaging his ex right after I had my miscarriage, also found him on different apps to hook up with women,