Possible Pregnancy?

Hello,

I had unprotected sex on May 5th, 5 days before I ovulate (as stated on the glow app). We got caught up in the moment and he didn’t have protection, so he just pulled out. I recently got off oral contraceptives on March as I was having terrible reactions to it. I didn’t take Plan B because it’s not easily accessible in my area.

I should be expecting my period on Monday, May 27th but I have an irregular cycle. I know being stressed can also delay my period so I don’t know if I’ll be late because of stress or because I’m pregnant.

How likely is it for me to get pregnant?

How early can I test knowing I’m irregular?

Please help me out.