Worried

Mommy~of~one
Okay ladies I am super worried I am supposed to be 10 weeks 2 days pregnant I went for an ultrasound 2 weeks ago because I was having bleeding baby measured 7 weeks 6 days so was only about 3 days off based on lmp ended up going back today for another ultrasound because of more bleeding baby was there and looked good had strong heartbeat but only measuring just over 8 weeks when should be closer to 10 based on last ultrasound dr wants me to have a repeat scan next week I am trying so hard not to worry but can't help it! Anyone had this happen and had everything be okay?