We recently found out we were pregnant with baby #2. (About 5-6 weeks along)

The other night I woke up in the middle of the night with pretty strong cramping and I went to the bathroom to check for blood immediately. When I wiped, I saw a small amount of blood. Instantly I knew in my head what was happening. I went to the ER. They did ultrasound, but didn’t see anything. (They said I could be too early to see anything if I’m only 5 weeks) my HCG was at 562. The next morning they tested it again and it had dropped to 500. My doctor informed me that I was likely miscarrying and to go home and wait for the blood to pass. I continued to bleed very lightly, but never got the heavy bleeding like he said would likely happen. They had me come in 2 days later to double check that my HCG was going down, and to our surprise it had over doubled since two days prior when it was at 500. I’m still bleeding (lighter than a period) and having light cramps on occasion. WHAT IS HAPPENING? My doctor called me with the news about my numbers rising and said that everything looks excellent for a pregnancy. But I’m still not sure. Something feels off. Has anyone had this happen before? What was the outcome? Any success stories about HCG dropping and then rising and having a healthy pregnancy??? HELP 😭😭