My last period was on June 27th. I had sex that night with a condom. On the night of july 4th I had sex again but the next morning found the condom int he bathroom. I took plan b as soon as possible. Exactly a week later I began to bleed and it was dark brown and began to turn bright red. It lasted about 4 days. My period was due on the 23 of july But didn't come. Could I be pregnant? or was that my period already?