What the hell....?!

So my last period was December 23rd, and I'm supposed to be 7+4 because u ovulated CD 20(January 11) found out I was pregnant on January 20(9DPO)... went to doctors January 23rd and their urine test was negative, but blood test was positive. had another draw on January 25 it doubled like it should have. today i went in for an ultrasound, And babies measuring 6 weeks and 1 day... a week and a half off... but everything was healthy 140BPM, baby was visible, yolk sack, and fetal pole.... but does that mean I ovulated like right before my period?! 😂 I'm so confused lol