Symptoms again?!

I suffered my second miscarriage (this one naturally) 12/21 the bleeding started and ended 12/28 so only 7 days and my hcg levels were a 10 the 28th. So here it is exactly 3 weeks after the start of my mc and I'm severely exhausted and have found myself a little too emotional last two days. I am desperately awaiting the arrival of Af so we can try again but wondering if there a chance a could be pregnant again?!? Doesn't seem possible and I took a test and got a bfn. I don't know when to test again or what to chalk this up to. So frustrating 😞😕 has this happened to anyone else???