Possible pregnant?

My husband and I do the pull out method, no birth control of any sort. We had sex on October 26, November 1st, November 5th. My "Flo" (another period app) & "Glow" says I have a high chance of getting pregnant October 28.

I had a period on November 12-17. which is longer than my normal period.

I've had bad cramp, nausea, headaches during period. Now I'm off my period I'm still having wicked nausea. It's to the point where I eat and a few hours later it returns

What are the odds that I could be pregnant?