Brown blood & small clots?

Katelynn • Proud mommy of a little boy and an angel! 👦🏽😇 TTC for our third since February 2016! 👨‍👩‍👧‍👦💕
So I started my period this morning (or so I think) but it is brown blood and I'm passing some small-medium sized clots. Normally my periods are dark. Not brown. Has anybody had something similar and been pregnant? I've also been having some dull cramps all day.