Every woman is different, but i wouldn't think you would have O'd just yet. Unless if you are a early O'er normally, but usually your cycles following a m/c are messed up and a little longer than normal. But like i said ever woman is different. It is possible to get pregnant before your first AF, i only know that because i did lol. 20 days after my m/c in December i ovulated and got pregnant. I don't really think that your at a higher risk of m/c, but i'm not sure on that. I did end up having another m/c. Good luck! And welcome to TTCAL
Also i'm so sorry for your loss