Just joined.

Hi, I've just downloaded this app as partner and I have decided to try for baby number 3. I have had the coil (mirena) for a solid 9 years with no breaks. I've also not had any periods because the coil prevented them. I have light spotting today but nothing substantial. I'm just wondering if anyone could help with information on how I'm going to work out my likely ovulation days seen as I haven't had a period for years. or do I count today as day 1 of the cycle? TIA x