How long do I wait?

I found out I was in the “final stages” of a very early miscarriage on Thursday the 7th of March. Doc said we can start trying as soon as next month. I’m wondering how long I have to wait to have sex with my husband again? I don’t really want to try hard but I’d like to be able to just BD and if it happens great if not oh well. Cause my husband will be leaving town March 31st for a month and a half. I’m just bummed thinking I’ll have to wait that long to even be able to BD again.