How??

My husband and I we haven't had sex to be exact since December 18 my doctor wanted us to not do anything to wait a week or 2 for my period because she thought I was pregnant (which I'm not ) so she said no sex sooo we waited still no period since my last one in November ok ..... now we can't do it because our oldest 2 year old he puts her to sleep in the futon mattress than be moves her and not like 5 minutes she's up again but not quite being loud and ends up waking up her brother, how can we keep her from waking up WE WANT SEX IT'S BEEN REALLY LONG