A little confused

Jay

So I have pcos and got on metformin and finally ovulated! So excited! I took a digital ovulation test and highest day was on 10/25 and we baby dances of course. According to my period tracker. My period will be here on 11/2. Last period was on 10/5. If I was was to fall pregnant. Would they go by my last period of 10/5 or possible conception of 10/25?? It is a week difference.