OPK - 2 different tests & 2 peak smiley faces??

I am using the clearblue advance digital test as i am ttc baby #1 after a terrible and very painful miscarriage. I took 2 separate opk's 2 days in row.. Yesterday & the day before. Both test had the peak smiley face, but hubby & i were only able to have sex last night (the 2nd smiley face). I'm concerned that we missed the most important day.. i.e to have sex the day before ovulation. can i still fall pregnant if i did it on the 2nd smiley face? and how do i know if i ovulated before or after having sex last night? sorry if the questions sound silly.. but I am new to all this and trying to get my head the best time to have sex, ovulation etc so i can conceive successfully.