How early can implantation happen?

Lorna 24.06.2019

So trying this month for our baby my fertile week is over tomorrow and we have baby danced a lot up to firtile week and the highest day of fertile and today we have baby danced I keep getting a head ache and I’m tired and feel a little pulling twinge in my left side I know it Carnt happen over night 😂😂😖 my last period was about 2 weeks ago and my next period is due 9th September any advice ideas??