HELP!!!

i need some clarification please.. so I got off birth control in October and ever since my hormones have been messed up my period last in November 22 until December 2 and then I’ve had bleeding for three days almost and still am bleeding. so my question is I had sex on the eighth seeing if I could possibly get pregnant, which I don’t think even happened. Since I’m bleeding. I’m going back to the OB/GYN to get my IUD back because I’m bleeding so much that it’s affecting my life and I literally have to change a maxi pad every two hours to an hour. I just wanna ask if I can still wind up pregnant from having sex on the eighth seeing how I got my period once again on the 10th and mind you my period is extremely heavy so I don’t even think sperm could last that long in my body with how heavy my period is.