Confused

I have PCOS and may have 2 periods a year. I have take fertility medications 3 times so far and did not ovulate. 2/14/20 I had l a Laparoscopic surgery to remove cyst from my ovaries and my OB suggested trying the medication again. Fast forward to August 21, 2020. I have a period on my own and begin the medication on the 26. I had my progesterone test on September 10, which came back as 6.6. September 23 I got my very first positive pregnancy test. I had EVERY symptom. Nausea, sore breast, constipation, peeing more often, starving all day long, etc. last week I felt like the symptoms were fading, I began having a brown/pink discharge. I went to the er Friday evening 10/10/2020 pelvic looks fine , abdominal ultrasound showed nothing and hcg levels were 5000. Had an appointment with my OB Monday 10/12. Did a vaginal ultrasound and I’m measuring 5wks and 4-6 days and my hcg levels on Monday were 5,578. I feel like my pregnancy is not viable. But other tell me I’m being negative. Can anyone here give me their thoughts or advice? Thank you in advance!