Correct weeks

Mia

So on this app the glow <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">nurture</a> it says I’m 32 weeks 5 days we’ll because I put in the due date my ob gave me , and on just the regular <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> I was using to track my cycle/ovulation I put in I’m pregnant and it says 34 weeks 3 days , today at my ob appt she checked my fundal height and she said I’m measuring 2 weeks ahead so she wants to do an ultrasound to make sure it wasn’t just the position/ fluid so could the regular <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> actually be accurate since I was using it to track my ovulation ? Just curious what everybody thinks