My last period ended on the 10th sept and I am almost two weeks late, previous I had some mild cramping in the adomanal area (this was 10 days after intercourse) and went to the bathroom to see, I noticed I had some brownish discharge to start with which never usually happens when I have my usual period. I then bled lightly for two days and after had some spotting which was a light pinkish colour then eventually went to dark brown spotting this lasted for Two days. Since then I have had a bloating sensation in my stomach every time I eat, even the smallest amounts of food which before never happened. I also felt slightly light headed on occasions and sometimes felt a little bit sick. I did a pregnancy test today and it was negative. What could be the reason for all of this?? May I also add we used a condom but I think it split as I think there was a bit of sperm on my bed sheets??