Does anyone else think their mind stimulates us to feel certain symptoms?

Currently, I am having what I would call pregnancy symptoms. I have pulling in my lower stomach, my boobs are sporadically sore, backache, headache, and consistent bloating/ hardening of stomach(such as I am no longer able to suck in the bottom part of my stomach) and have had these problems for two months. My last two periods were only two day long with spotting with one coming 4 days before predicted and next 2 day before predicted; which moved my normal amount of cycle days from 26 days to 21/24 days (never fluctuated like this before).

With this is making me certain that my symptoms are because I am wanting them to be there instead of early symptoms. I am overwhelmed because I just want a baby.