Welcome to the ehealthforum and I am really glad to help you out. Pregnancy occurs only during ovulation days which occur around 10-14 days post periods. Intercourse just one day before periods is less likely to result in pregnancy because there is no release of ova from the egg.
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.
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