Originally Posted by sonjam
Well there are a few things to considder. If you have a regular 28 day cycle, then what days were you having sex? Normally 10 to 14 days after the FIRST day of your last period is you most fertile days.... calculate those.... then are you using contraceptives? If you are on the pill, did you use antibiotics during the last month (sometimes the cancell out the pil)
Did you drastically lose weight, or exercise or stress this month? It could have an effect on your cycle!
Spotting on the day your period is supposed to start can be implantation bleeding, when a new ovum implants into your uterus to become a baby. The best thing for you to do to be sure, is get a home pregancy test!