Get your period AND a BFP??

Amie🕊 • My husband Tom and I have been married for 2 years. We are down to the final 30 days with baby #1! Fingers crossed that this all goes well!
This hasn't happened to me as of yet. AF started June 25th-28th...which is kind of short. The first 2 days were heavy and lots of cramping. Last 2 days were merely spotting. These last 4 days I have felt like crap, but not like sick crap. Just super tired and BLOATED. Sometimes nauseous even. However, no fever or body aches and pains that would indicate the flu. So I'm lost. I've also felt some odd cramps which I thought were gas, but I'm not gassy....I have heard stories of women getting their "periods" even though they were actually pregnant. I highly doubt that I am pregnant. I'm probably just far too focused on my uterus and making myself crazy. BUT has this happened to any of you ladies out there??