Possible miscarriage

I am 5 weeks pregnant and have been worried. I feel like my symptoms have decreased in the last week (boobs are not as sore mostly). The biggest reason I’m worried is because I went in and got a blood test the other day and it came back as 824. The doc said that was a little low for where I’m at. I’ve been having a lot of constant cramps and back pain, but it isn’t too much to handle. I’ve noticed some pink discharge on my underwear yesterday and today. I wondered if it was blood so I poured some hydrogen peroxide on there and sure enough it was blood. Anybody experienced this?