TTC after Miscarriage

I had a miscarriage in April of this year . I was and still am devastated. I’ve had two cycles after my miscarriage one being 30 days and the second being 28 days. I started spotting last Thursday ,6 days before my period is due . It’s now Sunday and I’m still spotting off and on and have had no clots. I don’t understand what is going on... if this is my period , then I don’t understand how my partner and I didn’t get pregnant .... I’m getting really worried and upset that we won’t be able to conceive again and maybe I’m not ovulating properly . But I had an ultrasound done the other day because I’ve been having weird pain. I had a slightly inflamed appendix which has turned out to be fine and my endometrium was thick and I had a collapsed cyst which meant I had ovulated on my right ovary.... someone please help or any advice?