am i ovulating?

hi, I recently got my copper coil removed after 6 years as we want to TTC. However I have really irregular periods, sometimes 8 weeks apart sometimes 10 or 11. As the copper IUD has no hormones etc I always knew this was 'just me'.. but now that I am actually ready to TTC I'm concerned that this means I'm only ovulating 3 or 4 times a year. I'm 31.. I have two children already but had them at 18 and 20.