Girls, my last period was December 16th, the test was positive, but on…

Girls, my last period was December 16th, the test was positive, but on ultrasound there was nothing, I go every week, I took a hCG test on January 27th, the result was 103, today I took a test and it showed 30, I know that it should be rising, now I'm going to have an ultrasound tomorrow, I'm scared and I'm afraid ? One time under anesthesia they cleaned up after childbirth, the second time they froze, then again live, again there were remnants, now again what?