Help before I freak out

I’m in a bit of a pickle. So I had unprotected sex on the last day of my period last month. He didn’t come inside me. Period was meant to start this week and nothing so far. I had cramps all day yesterday with some spotting so I thought my period was coming.

What are the chances of me getting pregnant from having sex in my last period day.

I thought you would have yo have sex during ovulation period.

Any advice would be great full

Any herbal remedies to make my period come

ThAnks