Could it be possible 🤔🤫

Hay guys I really need help. My boyfriend and I decided to have sex for the first time last month and I had my period a couple days later. And then we did it again this month and I’m late on my period. My stomach is feeling tight I haft to pee a lot and I’ve been having constant headache(but I’m also on migraine medicine) I’m only 18 and he 19 and our life together has just started. What should I do?? Any ideas?