So IDK what's going on. If I'm pregnant or not. My cycle changes from21 to 28 days . I had sex the day before ovulation. My periodshould have started 3 days ago. And on the third day I started bleeding. It's medium flow but brighter than normal. I feel nauseous, tired, hungry, headaches, slight cramps, fluttering feeling in my stomach and sore tots and boob's. Can I get advice e