Spotting before and early AF???

Natalie

Does anyone experience very light brown spotting up to 4 days before AF? I usually ovulate around CD16 but usually spot or AF starts 4/5 days before the predicted date. I’ve had blood tests at the start of my cycle and CD21 tests which all came back normal. This is cycle 13 TTC. Thank you 🙏 👶🏼 ✨