TMI WARNING So me and my boyfriend had unprotected sex last night and he pulled out like last…

TMI WARNING So me and my boyfriend had unprotected sex last night and he pulled out like last minute. He said he was just pulling out for a minute to last longer but he ended up finishing as soon as he did 😂 anyway I haven't gotten my period back yet since having my daughter.. do you think I'll be safe taking birth control right away? My appointment is on thursday. I've never been on any type of birth control but I know you might have less periods if any at all. And how will I know if it's because of the birth control or if I'm pregnant again LOL I highly doubt I will be but I'm paranoid now.