it could be from your m/c still or even from gearing up to O, getting ready to have an AF or even the wackiness of your hormones still. I wouldn't put too too much into it, our bodies can be so confusing after our loss(es) making it very hard to tell what exactly is going on.
To answer your question I have, it was frustrating to have pregnancy symptoms and not really be pregnant anymore
I've had my body trick me into thinking I was pg, even had bb's get real sore around O time. So fricken confusing!