I was on previously on birth control to regulate my cycle and came off of it in September. My cycle has been somewhat irregular since then, but I have still been having periods every month. I had unprotected sex last month (pull out method), but had my regular period two days after. It has now been 5 weeks since the first day of my last period, and I have taken several at home pregnancy tests, which came out negative. Could the late period still be due to me coming off of birth control? Or should I go to the doctors to get a pregnancy test completed?