I had unprotected sex on dec 10 and i am not on birth control. It was a drunken oops. Big oops. Now i got my period 4 days ago. Bit earlier than i usually would. For 3 days itd literally just be a spot. Id wear an ulta thin pad and throughout the whole day thered be one small spot the size of my thumb on the pad. And when id wipe, itd be a very light red color. On the third day, yesterday, it was even lighter and became a tiny brown. But now on this fourth day, its heavier but still a light red color. Should i be concerned? My periods are never like this, they just come late sometimes. This doesnt even feel like a period.