Since I got back from my trip to Seattle on the weekend of the 9the. My boyfriend and I had unprotected sex all weekend. Were not worried about getting pregnant but since I got back I been having alot of tummy aches and nauseous I ended up getting my period a week after but very different I never have weird periods this time was spitting for 3 days then very heavy day 4 and spotting till the 5 day it was gone. I'm a regular 28 day cycle and during my period I felt horrible and now 3 days after my last day I still feeling sick from my stomach and very nauseous after I eat anything. What's going on any advice?