I have a regular menstrual in oct my lmp was on the 26 of oct..and ending nov 1-3..i had inter course nov 13 and my mp can nov 26 and ending on dec 1-2 but it was really really light and i didnt need a pad or anything.. I only notice i was bleeding/spotting when i used the bathroom ..i saw it on the toilet paper.. It looked pinkish..could I be pregnant.. I took a test and it was negative twice