They did ultrasounds during our testing phase, but I can't get them done each month (insurance won't cover and I can't get off work to match their schedule as their ultrasound tech only works during my school day).
Nothing would indicate a lack of maturation though. The last time they did an ultrasound (a year ago January) I was within about 2 days of ovulation and they could tell that I had one jumbo sized follicle dominating. So, they didn't seem concerned that it wasn't rupturing or that it wasn't maturing.
If we aren't pregnant within the next year, they'll be looking for a hostile environment for the semen, but overall it just means I'd end up needing to go the IUI route, which I'd be doing by October anyway. So, I'm not sure how useful the test would be overall.