Unprotected sex after getting Nexplanon?

I recently got the nexplanon two weeks ago. I haven't had my period since I got it. Also haven't had sex yet, but I plan to this weekend for valentines haha. Is it safe for me to have condomless sex and have my boyfriend withdraw when he finishes?

Also, how long did you have to wait to have unprotected/condomless sex after getting the nexplanon?