Yes, it is possible. You can ovulate a lot sooner or later than expected, so there is no safe time to have unprotected sex if you are not trying to get pregnant.
Hello,
Pregnancy occurs only during the time of ovulation. Ovulation is the release of a single, mature egg from a follicle that developed in the ovary. It usually occurs regularly, around day 14 of a 28-day menstrual cycle. It is seen that pregnancy only occurs if intercourse occurs within the 6 days prior to and including ovulation. The best timing of intercourse in order to conceive is day 10, 12, 14 and 16 (in case of late ovulation) of a 28 day cycle.
I hope it helps. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.