Super super super light period, could i still maybe be prego???

So I'm on day 5 of my "period" I've had very very very minimal cramping, no sore boobs, bleeding so little that it's barely even covering the tip of my tampon. By day 3 I'm clotting (like gold ball size sometimes), cramping horribly and bleeding like crazy.. any idea what's going on? Anyone been in the same boat.

Oh yeah and my cramps aren't like my regular cramps it's only to 1 side not my whole abdomen.. and that's even if I cramp at all.

Any suggestions would be greatly appreciated.