Pregnant after having baby?!!!!!!🤷🏻‍♀️😫

I had my son on the 27th of October and had sex for the first time when he was 9 days old... I told my partner to pull out and he didn’t! what are the chances of getting pregnant that soon? I didn’t tell her This happened but My midwife told me I’m extremely fertile at this point especially if I’m not breastfeeding and not I’m shi**ing my self?!