Concerned

Im 5weeks and 5 days post partum. I’m waiting for my menstrual to start but I’ve been having all the symptoms but having a lot of white discharge no itching, redness or burning. My fiancée and I had anal sex at 3weeks PP my Q can semen seep out and go into the vagina and result into being pregnant? This is my 3rd baby(if pregnant itll be #4)so I know how sex goes and how pregnancy can happen but was curious and we’ve had sex but used protection and he kept pulling out to make sure the condom wasn’t broken. I go to my PP appt 2/7 so when should I expect my period to come??