Period then found out you were pregnant?

Courtney

I know this sounds crazy to even ask because it doesn't make sense but has anyone had their period then pregnancy symptoms follow? I had my period last week and I have been so nauseous this whole week. I just assumed I was out this month because I did have a period but I'm not feeling like myself. I know everyone's body is different and like I said, I know it's a crazy question to ask but has anyone had this happen? There's no way it was implantation bleeding because it was HEAVIER than normal. Thoughts? Advice?