Bleeding in early pregnancy but hcg steadily rising. (TMI)

Taylor

Started bleeding very heavily dark red/bright red clots and all about 2 days after getting a positive pregnancy test witch lasted 6 days and would have been 3 days after my expected period. Went to the doctor and they confirmed I was pregnant and my hcg level was at 18 witch is quit low or I’m super early is what the doctors explained so I went back to retest in 2 days and if more than doubled it was 89 has anyone ever had this happen to them? Have a “period” during pregnancy? And I use the word period because that’s what it felt and looks like but had anyone experienced heavy bleeding in pregnancy and everything was fine? (The blood came ever time I go to the restroom like that but never really getting much on the pad.) please help I would love to hear if this happens to anyone else!