Most women have a luteal phase (after O) of 12 to 16 days (although it can be a bit shorter), so based on that, in a 28-day cycle, you'll probably ovulate somewhere between day 12 and 16 of your cycle. However, it's hard to say after a miscarriage. Some get right back to their normal cycles, others have to wait a while before everything is back to normal. So sorry about your loss! I've had two myself :-(
Well i don know about ur case but normally u start ovulationg from the 11th day while having a normal 30 days cycle...did u try logging on to any online ovulation calculators which might help u assess when u might ovulate...it ll give u a span of days when possible ovulation might happen...as it may differ from person to person depending on the lenght of the cycle...