Anyone’s due date keep changing?

Megan • Ectopic pregnancy 03.01.17, 🌈👶🏼 Iziah 09.21.18, medical assistant, miscarriage 12.31.20 👼🏼

So I’m supposed to be 10 weeks based off my lmp. So I was due June 29th 2021. I had an ultrasound done last week baby was only measuring 6 weeks 3 days and was due July 12th 2021. . I just had another ultrasound done today because of some light bleeding and now the baby is measuring 8 weeks 4 days and now I’m due July 7th 2021. Like wtf is going on? Anyone else going through this?