I am 33 weeks and 2 days pregnant my boyfriend and i weren together long but we were having sex every day, pretty much and multiple times a day, but we split up for a while and on sept 24th 2008 october 2nd 2008 and october 8th 2008 i slept with my ex. i need to know what the chances are of the baby being my ex's?

it was a huge mistake i really am in love w my boyfriend and i dont want to hurt him.. PLEASE HELP ME!!!