ADVICE PLEASE

Currently 17DPO but still no period!

We’ve been trying for another baby for over a year , however every time I catch I’ve ended up having a chemical pregnancy, so haven’t tested this month yet! However I have had VERY small amounts of brown discharge over the last few days which is old blood. Has anyone else experienced this and not ended up having a period and been pregnant? Haven’t had any period symptoms either! Advice please ❤️