Chemical?!

I’m due to start AF tomorrow. I have been getting faint lines on FRER all week yet their getting darker. The frer is what I took yesterday and I took the digital Friday... I took a Walmart cheapie with SMU and got a faint line. I would expect it to be darker. I’m very irritable today... just how I am the day before AF and I’ve had light cramps all week. Kinda nervous this is another ectopic or chemical. Insights?!