Hi, I'm Sixteen Years Old And A Female. I Was

Hi, I'm sixteen years old and a female. I was supposed to ovulate August 7-11. Today's the 8th. About two days ago I had vaginal bleeding after i went to urinate; bright red with cramps. It only lasted about 2-4 hours and when I pushed, it came out. Very little. I didn't bleed the next day(only cramps) but today after I went to urinate and had bowel movement,i wiped and had a tiny streak of bright red blood.i had no cramps this time. But i was feeling odd the whole day. Uncomfortable. What can be wrong? I had a regular period from the 24-31 of July.