Someone please tell me this has happened to you

I have a very unpredictable cycle I can go months without a period or weeks with one, normally never heavy, well I had sex on the 4th, a day or two later I started the first day was light then after really heavy with clots and everything. That lasted around 20 days, for about 2 weeks I’ve basically had every pregnancy symptom there is. I took a test today and negative. So I’m wondering why I’m nauseous and can’t handle smelling food and craving and WHY DO MY BOOBS HURT SO BAD. I honestly think that’s the worst part. 😩