Why are people so ignorant

I’m livid right now!

I told someone I was pregnant and that I was 7 weeks 1 day and they told me my timeline didn’t add up . Like wth do you mean !

My last period was July 9

Ovulation was July 21-25

I had sex on the 18th , 23rd and 26th

This person tried telling me there was no way it was right if I was 7 weeks with a ultrasound confirmation of 7 weeks telling me the ultrasound should have been 5 weeks . Why are people so ignorant to conception !

Just wanted to vent !