I believe I ovulated a week early then the app said and I may technically already be 4 weeks BUT 6dpo I implanted, had bad cramps and backache for 2 days off and on and light cramping since then. The last 2 days I had extreme afternoon fatigue and I was curious to see as we had only tried this month for our second. So happy and can't wait till 13 weeks to spill all the news