baby’s suddenly not measuring to size at 9 weeks

So I went into the ER when I was 7 weeks and 2 days because I had a bit of spotting. They did an ultrasound and told me that the baby is measuring right where it’s supposed to and it has a good HR of 157. Then they told me that I had a small hematoma, nothing to worry about too much but they put me on pelvic rest. Well I went back in yesterday when I hit 9 weeks because I had even more spotting and it scared me. They didn’t give me the paper from the ultrasound like they did the first time, so I had to wait until this morning to see the results on the patient care portal they have online. Only to see that my baby’s HR has not gone up at all. It’s still at 157, and now he’s measuring 8 weeks and 4 days. The hematoma is 1 cm big. I also saw that my uterus size has actually gone DOWN since the last time. They told me that everything was gonna be fine, that the bleeding was most likely from the hematoma. But now i’m super scared because he’s not measuring to what he should be and the HR hasn’t changed at all. Has anyone ever gone through this? Reassurance would be amazing. Not to mention I also had a miscarriage last year around this same time so it’s a bit worrisome. the first picture is my sonogram results from yesterday, and the bottom is from when i was 7 weeks