My period started from Jan 25th to Jan 31st. My cycle is about 30-32 days. I had unprotected sex on Feb 5th around 5pm. He didn't ejaculated inside but I worried about the pre-cm so I took Plan B the next morning at 9 am. 5 days after I took it (Feb 11th) I had bleeding which started with brown blood and then turned into red and last for 3-4 days like my usual period. My period is expected to be on Feb 25th or 26th but I am now 4 days late. I took one pregnancy test on Feb 25th, one on 26th, and one on 29th. They all were negative. Is there a chance of me being pregnant despite of negative results? When should I expect my period to come? Should I count 30-32 days after the initial bleeding from Plan B?