What’s going on?😩 Chemical?

I’m somewhere around 12-13DPO and had my first faint positive on Friday 9/10DPO but since then my tests haven’t been getting any darker! I’ve used the Easy@Home ones, Clear & Simple and now Clearblue and they all look the same😫 I’m chalking it down to being a chemical so just playing the waiting game. I’ve no spotting or cramping yet though. I’ve still been feeling really nauseous after eating etc.. Want to hold out hope but after a loss 3 months ago I’m not hopeful.