I'm a little concerned about my pregnancy tests and after any advice that can be given.

I tested at 10dpo and got a faint line tested again 11 dpo got a slightly darker line then today at 12dpo the line barely came up.

I've been experincing nausea, sore breasts, light intermittent cramping, excess saliva production and headaches my period is due tomorrow.

Am I pregnant or is it all in my head I just don't know what is going on...

Tests are in order starting with 10dpo