Don't panic Cortney! If I were you I and I wanted an attempt soon I would either have him release twice in quick succession this evening, with your attempt being the second release (use a condom or release without DTD first time round) or, if he's up for it, do a 'compressed frequent release' and have him release twice today with a few hours between each and then have your attempt early tomorrow morning, so he'll have released 3 times within a short space of time.
You could take Zyrtek during the day and Benadryl tonight (but not too much if you want to wake up in the morning for your attempt!!).
GL whatever you decide.