SpermCheck Fertility Question?!

Sam • 22. Married. We have one precious little girl. & TTC for #2!
Anyone used this?! To check your so's sperm?! I was wondering if anyone has or know how accurate they are. I bought one it was over 30$ for just ONE damn test. Because I have been TTC for our #2 for over 6 months and was wanting to see if anything was wrong with him. This was the result. Everyone sees a faint line right?! It got darker over time but it said to read it at 7 mins and after that it wouldn't be accurate. But it stayed the same. Any suggestions?