Cycle suddenly shorter?

Sasha
I don't understand what's going on. I used to have pretty regular cycles, around 29 days long, and I would generally ovulate around day 14 to 16. 
Then I had a chemical pregnancy, bleeding at what would have been 4.5 weeks. 
The month that I had the chemical, I had what seemed like a normal cycle afterward. But then the cycle after that was only 22 days, and it seems like if I ovulated at all, it was around CD 8. This month it seems like once again I ovulated (if at all) on CD 8. 
Any idea what could have caused my follicular phase to shorten down to just a few days? What does it mean? Can I still get pregnant while it's like this?
Any information or advice would be appreciated. I will probably call my doctor at some point, but maybe not until next cycle, just so I have more solid data instead of just one 22 day cycle.