A little confused

Hello, I'm concerned I'm 18 days late going on 19 and I experience the common symptoms sensitive breast or nipple area, light cramps light headaches and backaches, some nausea and heartburn. Now I never experienced this before I had some light pressure in my belly and or uterus area it started at week 3 a week before my missed period. I took 3 test one when I was 3 days late, 5 days and I think day 7 all neg. And if I am pregnant I'm 6 weeks and I notice some light spotting that lasted an hour. I want to go to the doctor but I'm afraid that its going to be negative. I just want an idea has anybody experience this and was pregnant?