I have questions to ask. First one is that I got my nexplanon and wanted to know how soon to get…

I have questions to ask. First one is that I got my nexplanon and wanted to know how soon to get pregnant. I have been taking pregprep. Second one is that I just found out my fiance is smoking and I didn't know for a few days how should I feel. He said that takes away his stress but I want to know how else to relieve his stress.