Help I need advice

Okay, so my fiancé and I, had sex on the day I ovulated and a day after. July 17th and 18th. I have been really crampy, I have been throwing up in my mouth the last 3 days, I am EXTREMELY tired and I can't touch my boobs their sore my nipples keep getting tingly feelings my periods due in like 5 or 4 days now. I can't drink Diet Coke it doesn't taste right anymore and some food turns my stomach. This isn't usually what happens with my periods so I'm confused. I have two children already and with them I knew either right away and with my daughter I had NO symptoms and didn't find out til 9 weeks pregnant.