J.D.
Since you don't have a confirmed pregnancy, I would not automatically suspect that you are miscarrying. Have you ever had history of PCOS or endemetriosis? It sounds like you are having hormonal changes with the hot flashes which are consistent with these types of issues.
Your doctor should be able to give you more information, but for now, take a tylenol and keep your feet up as much as you can with an 8 month old.
Good luck dear!
Jodi