Ovulating twice in a cycle?

I had a miscarriage just over a week ago and as soon as i stopped bleeding i started doing opks again. The first day i got a positive (clearblue digital ovulation test) so the smiley face and so my finace and i started trying again- then a couple days later i did another test and got a negative result. So i just assumed i had finished ovulating then today i did another test and got a other smiley face so i am apparently ovulating again? Is it possible to ovulate twice in a cycle?