My boyfriend and I are kinda nervous about being pregnant right now, we want to know how long it can take for me to conceive after he finishes inside of me? Does it take weeks or months? I also started birth control in December and the doctor said I could spot for about six months or my periods may just go away, well I am 4 days late for this months period, and I am always on time, I don't miss my periods ever. I haven't spotted for about a week and Halle now and it was very little spotting in the first place, I also have cramping every once in awhile.