Late AF

Hiii. So last week Tuesday I had sex, we used a condom and he always checks it properly afterwards to see if it leaked or something and it didn’t. My period was supposed to start on Saturday or Sunday and today is Wednesday and it still hadn’t. I have my usual PMS symptoms (lower back ache, sore boobs, mood swings💀) but no period. Instead, I have a yeast infection now which started yesterday. Is this normal? Or is there a chance I may be pregnant 💀💀