Worried... Help

According to this app, I had unprotexted sex with the guy I'm dating on my most fertile day. He said that he ejaculated (only a little) inside of me... I'm wondering what the odds are that I could have gotten pregnant?

I had slight cramping beginning 2 days after Sunday... and periodically during the following week.

Now, I'm experiencing bloating... I'm not scheduled to begin my period in 6 days.

Any suggestions or experiences with the accuracy of this app and it's ovulation timing?