Possible ectopic?

I went in a couple days ago for my first ultrasound at 7w1d and the couldn’t find anything in my uterus. My HCG level was at 4,375, pretty low for 7 weeks, and then today I got more blood work done and my HCG was at 5,091. I’ve had 5 miscarriages previously, does anyone have any knowledge in this area? I haven’t talked to my doctor yet, he should be calling tomorrow. Any advice is appreciated ❤️