Am I pregnant? Please help. My periods are really irregular.

1st - Jan 31-Feb 5

2nd - Mar 11-14

3rd - Apr 26-29

4th - Jun 11-15

5th - Jul 12-16

6th - Sept 2-9

 

This morning, I peed and wiped mine using tissue and found brownish discharge. Last Sept 13 & 14, my partner had sex and a quickie, respectively. I remember he told me that there was blood in the condom right after. What could have happened? I'm not a virgin when we did it last week. He used a condom, and the condom did not pop. I am not experiencing any other pregnancy symptoms. Could I be pregnant? Please help. I hope this is just hormonal imbalance.