Yes, if you are getting a period, I believe that means
that you are ovulating since that is what a period
is is the unfertilized egg released during ovulation. If you are having periods only 3 or 4 times a year, I'm sure you are ovulating, just not every month like the average woman. That doesn't mean you can't get pregnant. It just means that you may have a harder time with not knowing when you are ovulating or when to expect it.
I suggest doing what BTS said as far as charting.