Help post

Hi ladies, little bit confused me n my husband trying for a baby for 2 years almost but we can’t have sex at any time we want as we have to live with my MIL she is always sits between us the whole day so we can’t spend time together we can only intimate at night like 2 am when we both are tired after the long day so can’t enjoy it so can not do this more often because if the timing, i am confused is this the reason i am not getting pregnant is there any timing for baby making sex? Its impossible for us to intimate at day time bcz of my MIL and this is really sad and frustrating. How many times you need to get intimated to get pregnant?