my last period began the 15 of July 2010. my cycle is 28 days. i had unprotected sex on the 27, 28 and 31 of July. My next period is supposed to come on the 12 of August 2010, however today i saw some blood. i thought that i had sex on my fertile days and would have conceived but it seems im having difficulty conceiving. Could i still become pregnant although i am seeing this blood