Misdiagnosed miscarriage?

Kristin

So Monday my levels had went from a 26 down to a 17 and was told I miscarried. (I was bleeding quite heavy) well today I just had this feeling to want to take a test. I took a digital and it said pregnant but those only test to a 25, and then right after I took a cheap test and it was positive and the line looks darker than the ones from a week ago. Is it possible for your levels to drop and then still have a healthy pregnancy or am I just going crazy??