preparing for the worst

so me and my hubby have been trying and im 4dpo and i have even had nausea and my stomach had been feeling really hot and I've been exhausted and i thought maybe i could be but I went to pee and i noticed some white discharge similar to lotion and I've been reading that that means it's infertile which probably means I'm not pregnant and I've been trying for forever and im giving up hope. i had sex during low high and peak ovulation i don't know what i did wrong 😭😭😭