Helppppppp me please

So I had a miscarriage Dec 23,2019 and a D&C Feb 21,2020 i got my period April 16-22nd my ovulation date on my calendar says 7 days till I ovulate and the chances of me getting pregnant is 7% i had sex lastnight so a day after my period and I didn’t use protection but he pulled out I know people say you can get pregnant with pre cum I’m not ready to get pregnant again and they say after havin a baby you get pregnant faster in the first 3 months of havin a baby should I take plan b? Or should I be okay?