I think so, sweetie. Sperm can live inside you for a while. Did you have EWCM/did you use pre-seed/conceive plus? If so, chances are pretty good. If not, chances are lower. GL!
I know someone who one time and it was about 4 days before her chart showed she O'd and is about half way through her pregnancy.
Shettles method of ttc a girl would mean you only BD up until 3 days prior to ovulation. Plenty of women follow this method and get pregnant so your defo in with a chance.