Am I pregnant?

I’m late on my period 5 days, and I usually have a very regular period. I was supposed to start my birth control after this period but obviously that never happened, i used the pullout method and didn’t have sex on my ovulation day but I did have sex 3 days before, I took 2 tests after I was 3 days late and both came out negative. Should I be worried? In addition, I had a yeast infection about 2 1/2 weeks ago so maybe it could be the medicine throwing it off idk, I’ve also been super stressed from personal stuff. Could I be pregnant?