Questions but please don’t judge me I already 😔

I recently went in for my Anatomy Scan an was told I was 15 almost 16 weeks when I was supposed to be 14 weeks and they could see what I am having (ITS A BOY🙌🏾👏🏾😍❤️🌈)does that mean i ovulated a week early??? I really don’t understand the whole ovulation thing and would just like some help on trying to figure out who my child’s by (still gonna get a DNA test done) but just want an idea 💡

Thanks in advance ladies