I feel like even when I am pregnant..I'll never see it on a test!

Hi guys, my first time posting here! Personally I think I am pregnant right now, I have a LOT of the symptoms and currently 3 days late for my period. Instead of my period I've been having a lot of whute discharge which is apparently a good sign too. The only thing is, I can't get a bloody positive on a home test.

When I was pregnant with my son (he's now 6), I took 3 tests, all negative, but I was that poorly the doctors did a full count blood test..low and behold I was pregnant! I walked out of there and purchased a clear blue test...negative! I couldn't believe it..I went for a scan the week after and I was 3 months and 12 days pregnant! Well you can imagine my shock lmao! I really feel like I'll never see a positive on a test. Is it just me that they don't seem to work for??!