Frustrated 😩

So I had my son, December of 2017 and got an iud put in March of 2018. Got my iud taken out December 2018 to start trying for baby #2 and I can’t tell when I’m actually ovulating. I can tell for the most part with my cm, but that’s it. I didn’t have a postpartum period before my iud or while it was in due to breastfeeding and have only had 1 (maybe two) after getting it out (Jan and two days in March). I’ve only seen positive twice from an ovulation test. I’m so frustrated 😩😩