I'm so confused

JM • 28 started TTC #baby 1 June 2016. 2 and half years 🌟
I have a question. 
If you BD say on a Wednesday night but you BD at like say 2-3am in the morning is it still counted as Wednesday or is it counted as Thursday early morning?
We've BD on the 11th, 14th and 15th, my fertile window starts on the 17th till 22nd 
But I leave on the 20th, am I still gonna have a chance BD on all the other days? Or most of them ? Plus the days we did before the 17th?