My last cycle was December 20th-24th. I had sex on the 25th the day after my period ended, early morning (light spotting) and then again on New Years (early morning). I have a normal cycle 28-30 days and my period is always 5 days long. I am due September 25th. My ultrasounds are spot on with NY intercourse. My first ultrasound they said I had just hit 5 weeks because it was literally nothing to see except a gestational sac. If I would have conceived a few days after Christmas wouldn’t that ultrasound been further along into the 6th week? I did ask my doctor and she said I likely conceived 31st-January 5th. Am I overthinking this?