Cancelled IUI too many follicles

Hi Ladies I have been taking Menopur and Femara getting ready for my third IUI. I went Thursday for an ultrasound and had 9 follicles, she had me come back Saturday and I had 12 all good size. So she cancelled my IUI because of the risk of multiplesand said I need to take birth control until my next period and abstain from sex for 7 days. Taking bc and no sex seems counterintuitive to what I’m trying to do. I haven’t started the birth control because I am considering saying f that and trying to conceive naturally. Seems like a waste to have so many follicles and not try. I feel like since I’m 38 yrs old that the chances of multiples is slim. Anyone have a similar experience? What would you do?