i am im having a problem that i want to get a answer to .I just had my cycle on the 13 of dec in which it ended on the 15 of december.On the 18 of dec i notice i small drop of blood in the toilet after using the bathroom.I remember having sex right after my cycle ended only a day after.I really don't feel any changes now and it's to early to tell.Right now i'm hoping that i'am pregnant.Could you please tell me what causes this because this is the first time this have happen to me ? ? %-)