WEIRD PERIODS AFTER BEING A WEEK LATE

Sierra
A month ago i was a week late for my period , i thought i was pregnant because i was supposed to start on the 30th or the 1st but i started to bleed on the 6th which was a little heavy but not like usual , only enough to fill maybe 3 whole tampons , it only lasted maybe 2 days i was able to have sex on the 8th with no sign of blood . So this month rolls around , i again started bleeding on the 6th which was again a little on the heavy side , but yesterday it started to end and by this morning i dont have anything . I have cramps but not as much as last month in fact ive barely been cramping this month but i have noticed ive been peeing a lot more than i used to but at night & early mornings . I am so confused please help!!!