When does tww start for me?

Katie • 27 years old, married
 I finally had a solid smiley on my digi test yesterday PM (after 7 days of high flashing morning tests) as someone on the forum suggested I try an evening test. I was thrilled as beginning to think I had missed the big O. But now I'm not sure when I am/was best to have done BD and when will I have O'd? 
​ 
We BD the night we got the solid smiley (wednesday) and the Monday (and every other day for a week before). Is that likely to have caught it?! My husband is away now so hoping last night is enough?? 
I have cramping pains today if that means anything and I don't normally get cramping even for AF. I had a migraine for the week building to the high test and the two days prior to the high result  I had a weird pressure in my uterus area.
​Anyone know when I O'd??? And therefore when does my tww start! 
​First time ttc, wish me luck!