If got precum nov 5 then had period nov25 to 30.can implant happen dec 10? i got spotting dec10 nd 20. i didnt had sex just got maybe precum last nov5

Safe after 5-7 days: Sperm inside a woman will be history after 5 days. Nobody knows how many sperm, out of those that she obtained, would actually be around for 5 days. Some sperm peter out (gradually get exhausted or stop) long before then. If a couple is very lucky or unlucky, depending on whether a cute little baby is the goal, sometimes there's sperm hanging in there until day 7 after sex. Life can surprise you!