Okay so, I have pretty much the same question. I've heard of people that have been able to conceive a day before their period. My period is usually pretty normal. Okay not usually. I can determine the day of the month because my period comes like clockwork. Well, I had sex last Friday and we were naive and just used the "pull-out" method. But during foreplay, he said he did cum. So I didnt realize the risk of this until two days later (Sunday). I'm trying to stay calm. I managed to stay calm yesterday. However, this morning, I woke up to find a really dark brown discharge and it had some red/pink spots in it. I'm due for my period tomorrow. However, this made me nervous. I know they say it could be old blood. However, it's making me nervous because I do normally get old blood but it's like at the end of my period. I don't usually get it at the beginning of my period like this. I already told my boyfriend the possibility of this on Sunday, and we were both calm and talked it out. So I have no reason to be stressed right now. I'm also having pain on my side as well which they say that could be the implantation (if i am pregnant).