The week after taking plan bpilll I started lightly spotting. Due to the medication i lasted about 2-3 days my period was suppose to come on September 16 but it didn't on the 17th I was spotting again it was brownish pinkish I thought it was the start of my period but when I got up the morning of the 18th an went to the bathroom I was no longer bleeding . Is there a chance that I could be pregnant ?!