Can your body trick you?

A week ago I had unprotected sex with the withdrawal method, but i've noticed that he gets a moderate amount of pre cum. We also had sex during my ovulation, either way I'm "freaking" out because right now I don't want a pregnancy and I'm now gonna be on more precautions. ~

I know your body can trick you into having the symptoms like nausea and cramps. What about tender breasts/growth? and peeing more often? My period doesn't come for about 10 more days and I almost never get these symptoms this early, also whenever I wake up I feel queasy but then again I'm not really gonna trust it. I'm 2dpo and I'm just dying to see a negative and move on.