There's no way to stop it. I wish there was, but once you've started, you've started. But there's nothing wrong with laying a towel down on the bed beneath you and having sex on your period (it actually does help with the cramps, even if briefly), just remember to still use protection regardless because you can still get pregnant if you don't.
As far as next month, you can talk to your gyno about starting birth control pills and taking the active pills only four months in a row, having a period, then doing it another four months in a row. However, chances are if you've never been on the pill, your gyno will want to see how you react first and have you on a monthly basis at first still, depending which pill she gives you.
Thanks hun for the advice,my gyno is getting a call first thing Monday morn,hopefully my period will be gone b4 then