Curious

I go to my first ultra sound next week but I’m just trying to get an estimate of how far along I am. My last menstural cycle started on 11/11 went for three days. Me and my husband baby danced on 27-29 that’s when I ovulated. I’m always irregular tho. Only those days after my cycle. I had a bfp a week before my period with a clear blue digital. I tested on 12/16