My dr first thought I was between 5-6 weeks along according to my last period. Sunday at 4am I went to the bathroom and had a little brown blood, throughout the day Sunday I continued to bleed, I wouldn’t say heavy but I also wouldn’t consider it “spotting”

I went to the ER yesterday morning and they took my blood, Thursday my levels were at a 9 and yesterday they were at 37. Speaking with my doctor she said she thinks she may be off on how far I am and I could be implanting. I had mild cramps for a bit yesterday off and on, and one kinda big clot come out that was like a thin layer of skin. I am still bleeding as of right now but I have like NO cramps. Just such a dull ache that I barely feel. I’m 24 and I had an ectopic at 19. I’m broken and I don’t want to lose this baby. Has anyone experienced this and continued on with a healthy pregnancy?