My boyfriend and I had unprotected sex (pullout method) on the 26th of January. I was due to have my period sometime around February 2nd (I usually run 28 to 30 days), but instead got symptoms similar to ovualtion - increased wetness and thicker. About a week later, Feb. 14th or 15th, I had this odd brownish pink "spotting" that lasted about five days. I took this to be an odd period (I'm usually on the heavy side of flow), since I took several pregnancy tests starting the day of my miss and always got a negative. Assuming that was my period, I should have started again around the 14th of this month, but as yet have seen no signs of a period. I took another test on the 17th - again negative. I know there is talk out there about pregnancies going undetected for up to three months, but women just "knowing" they were. If I am, this would be my first, so I have no idea whether I have symptoms or not. I've been sick several times since December, been on antibiotics, and had a tonsillectomy on the 7th - all of which can throw my cycle off. Should pregnancy be a concern at this point, or should I just look into seeing my OB/GYN about regulating my cycle?