Did I Get My Timing Right?

Hello all, I have been ttc. My predicted ovulation date was on the 17th, we had sex twice on the 14th, once on 16th(by 11pm), once on 17th(by 6am) and once on 18th(by 4:20am). Did we get our timing right? Can this lead to pregnancy? Please help me with answers as I am really willing to know.