Need advice please!!

My period was due the 20th, and it has been coming 3-4 days earlier than due the last few months(I track on an app). I usually get bad cramps the day before my period. Well it's the 21st, I still have no cramps and no period. my boobs have been super sore and itchy for at least a week 24/7. I have been really nauseous off and on since the morning of the 19th. I have been having lots of lingering headaches and peeing more frequent. I have been extra moody and horrible mood swings(I never suffer from pms symptoms like moods and stuff). I have had a clear to white discharge everyday for a week. I get annoyed and irritated fast and I have really bad hot flashes and cold spells frequently at random times. I took a pregnancy test this morning(21st) and it was negative. What do I do now? any suggestions? has anyone been through something similar? I had unprotected sex on day 16, 17, and 18 or 19 of my cycle. thank you!