stunted growth or double ovulation?

I live in The Netherlands and am pregnant. Today I went for my first echo (the so called "vitality Echo"). This gave a somewhat ambigious result and I am not sure whether to feel delighted or slightly concerned:

There is a hearbeat (which is a sign of life!), but the maternity nurse claimed that, on the basis of the size of the embryo (5mm), I am only 6 weeks pregnant (=42 days) and must have conceived around the 18th of March (PS: at 6 weeks the embryo is in fact only 4 weeks old, as there are 2 weeks added to account for the start of my last period). 

This will not have worried me if I had not been charting for some time (around 8 years with 3 years of data on my app). 

According to my last Cycle-chart, my last cycle started on the 21ste of february 2020. My temperature regime went up 19 days later, on the 11th of March. I registered ovulation pain on the night of 9th of March. I also felt ovulation pain on the 10th. This then was followed by the usual steep climb in temperature. Both these cues suggest that I ovulated, and  conceived a week earlier than the nurse suggests on the basis of my echo. 

I showed the nurse my chart and she didn't really know what to make of it, but she did suggest that either (a) I must have ovulated later than my chart  suggests OR(b) I had a second ovulation a week later, or (c) the embryo is not growing adequately.

We have planned in a control vitality echo in another 2 weeks. This should determine whether there is a stunted growth (which would not be a good sign). 

My question to you is: are "a" or "b" even likely? I have never heard of double ovulation (whith a delay in the second ovulation of around a week) and it seems to me pretty unlikely that i DID NOT ovulate around the 10th of may. After all, there is a really distinct temperate regime increase. And I have never experienced a temperature increase that was not followed by menstruation within 14 weeks. 

For your reference, some personal information: I am 37, I am a twin (fraternal),  I have irregular cycles (throughout my life), ranging between 25-40 days, but usually around 30. I occasionally have a very long cycle (40 days), but this happens only about 1/10 times and usually correponds to some distruptive evennt (illness, or holidays, or partner away for long). Generally a short cycle (say 26 days) is followed by a somehwat longer one. I do not take medicine and I TCOYF for birthcontrol. Have been doing that for more than 10 years. Has worked fine for me. roughly 12 years ago I got pregnant (was not using TCOYF at the time) and had an abortion. 

I hope this information can help you make sense of todays echo result. Happy to share my last chart if this helps. 

Many thanks in advance

Anne

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