Pregnant or not?

Hi ladies. I expected my pms last april 18 but it didn't come out. The following day and every after one day, i keep having a brown and little red spot. For the record, i had intercourse during the last day of my "safe" days. That was March 30. My fertility will start the following day which is the 31th. I had a chance to check the time after we had it, it was past 12am in the morning. That time we had intercourse i was bleeding a bit. Until now, no pms yet. Is it possible that i am pregnant? I haven't do any test yet.