I just get pregnant test and is neg but i think i am pregnant my last period were feb 19 so what day i might consived. thank you?

14 days later: On average, women ovulate on about day 14 of their cycle, with day 1 being the first day of full flow. Conception occurs when there is sperm in the tubes at time of ovulation.

Wait until you get a: Positive pregnancy test before you consider conception. If u must, add about 2 weeks to the first day of the last period. That's when you ovulated. You got pregnant within 12-24 hours after but sperm takes a couple of days to get into position to fertilize and can live up to seven days. Good luck, pregnancy tests are reliable, generally.