Test pregnancy at 4 months

I have a gut feeling that I might be pregnant, I think around 4 months, but I haven’t taken a pregnancy test. Will the kind of pregnancy test kit u can get from Watsons or guardian show that I’m positive? I’ve googled and have gotten answers that if you’re quite far along in pregnancy, the kit won’t show that you’re positive bcos it can’t detect the very high HCG level in your body. Should I go straight to the polyclinic to get a pregnancy blood test or should I still take the home pregnancy test kit? Anybody has been in my situation?