I woke up this morning (8/13) at (7:40) and as usual had gotten up to use restoom and then i had a really bad cramping (like gas) in my lower stomach just after finishing emptying my bladder and then it was like i got a really bad period with clots and blood so i thought nothing of it other then "that was sudden" now i have no period symptoms and very little spotting if any (all symptoms and spotting has stopped now)

There was a pressure (like gas) before the "period" happened then nothing.
I have had unprotected sex without a condom a number of times with my fiance.
I was having pregnancy symptoms and was gonna test if I was late but then this happened.
I'm just so confused.
Please help me try and understand. I've been stressing all day.

I had spotting on 8/2-8/6 VERY light. Not anyware like a usual period. It was way to long and the days were all very light, usually the second day is heavier then it was with this one.