Hi Shell
Yes, there's definitely a possibility that you can ovulate in the month following m/c, in fact some women fall pg again before having their first AF, but first cycle is usually unpredictable and can be longer or shorter than usual (anywhere between 3-8 wks).
As for using OPK's this month, if you've got plenty of cheapies and don't mind using a few then go for it but it may be worth just checking other ov signs this month (CM/CP) as it may be harder than normal to predict when to start using them.