I kept having chemicals. Had a pelvic scan which showed my lining was really thin, so I researched how to improve this, couple of cycles later we were pregnant and I currently have a ten week old in my lap.
I would suggest getting checked out if possible to save wasting time and to avoid this happening again if possible because it really is heartbreaking. I left it ages. Almost 18 month before getting checked out. I regret not doing it sooner.
In the meantime, providing it doesn’t interfere with things re PCOS, or any drugs you’re on, you could do what you can to make sure things like lining is thick (seems to make sense to me, the reasons sticking out for a cp would be abnormal cells or lining before other things I imagine since you need a good lining for successful implantation), eggs and sperm are in good health, healthy blood etc all things you can do yourself to increase your chances of a healthy pregnancy.
FWIW I do see that line clearly. Yes it’s faint, but until you start bleeding (if you do) then there’s always a chance you implanted late and the other tests are just not showing up as good. I remember my ICs were much darker in the afternoons and evenings rather than with fmu