Currently trying to work out my dates.
I had unprotected sex over my fertile window in March however...
I had my period 11th - 17th March. Very all over the place, super heavy for a few days (had to get tablets to help ease the flow) then stopped for 3 days then a few days of just brown discharge on wiping.
I had a external scan done on the 17th to check for fibroids etc. It was clear. Lady said my uterus looked good and healthy and exactly right for my point in cycle.
I had sex once in April and it was outside my fertile window by 3 or 4 days. We used a condom. There was no breakage.
I'm now pregnant. I thought I was 4 weeks. However I'm now second guessing the possibility something was missed last month. I didn't do a pregnancy test last month as I assumed the scan would pick it up - but I vaguely remember being told that a early pregnancy is only picked up on internal scans. Would it still be possible to see something on a external scan at, what would be, 4ish weeks?