Wife has an IUD so she doesn't have regular periods and only spots a little if she does... No tampons. She occasionally tells me she's hormonal (crying, angry at the world, and feels "blah") but it's random... Could be 2 weeks or a few weeks from one instance to the next. She's also been taking a daily SSRI for as long as I can remember. Any reliable way to track or estimate when she's ovulating?