How long can sperm live inside the vagina?

I BD with my boyfriend on November 25th. We decided we would try to try this month for a baby, however he works out of state and wont be back until the 12th of Dec. No way I can conceive by then. He ejaculated inside me 4 times on the 25th. Just wondering if any of you ladies became pregnant with the dates similar to mine. I know its a long shot..but I guess im just ready for a baby now. If it happens this month Ill be happy if not ill be okay and theres more time to BD. Thank you ladies ❤

Im having alot of pelvic pressure and cramps.

I understand this can be a number of things. Any success stories would be appreciated.