Sperm count test

Hi all,
​My partner has used glow for a while now and we have been trying for about 18 months to get pregnant. 
I am a 29 year old male and have started to wonder whether I have a fertility problem. So I went and bought a new product in Boots which checks the sperm count of men. Its a bit like a pregnancy test (2 lines and you're normal and one line means you are low).
​So I did the test and only one line showed. I'm absolutely devastated. I have booked an appointment with the doctor so they can do a full test, but I just wanted to know if anyone else has had similar problems with their DH and whether they managed to get through it and conceive. 
​I feel like I'm a broken person now. I know I shouldn't, but honestly can't help it.