Has this happened to anyone?

Angie • I`m 32 with 4 kids. Married to my husband for 6 years but been together for 11. I just had a tubal reversal July 23rd 2015. Hoping to get have one more blessing brought into my life.
I supposedly had a miscarriage. My beta levels went from 24.1 to 34.1 to 62 to 162. I am totally confused as to what the heck is going on? Anyone have any insight. I am terrified that if I did in fact stay pregnant or possibly a vanishing twin that something could be wrong with my baby because my numbers are so low. I don't even have the slightest clue as to even how far along I would be if I am still pregnant. Or if it could possibly be ectopic but I have no symptoms of an ectopic. And I've passed tissue and clots last Monday and tuesday. I don't understand.