I recently had a baby on december 31

Hi I'm 19 years old I had a little girl on December 31 and I know the doctors said not to have sex before 6 weeks because it's very easy to get pregrant again well it's been past 6 weeks and I haven't had my 6 week check up yet because my doctor has been on vacation and Ive had sex recently but my boyfriend used a condom should I of waited until my check up or it's OK as long as we used protection?