5DPO help!?!?

5DPO cramping on lower abdomen left side and occasional shooting pains in left side of stomach, also experiencing back pain in The middle of my back, very tired!! 2 DPO had brown discharge.
CM is sticky and white in color. I know it's early, took a PT came up with v v v faint line. AF isn't due until 31st, today being 21st. Are these early pregnancy symptoms or is it my mind playing tricks on me because i desperately want to know and want a BFP