Side effects of stopping the pill

I stopped taking the pill after my last period which ended on September 4th. My husband and I aren't looking to get pregnant but wouldn't be upset if we did! We had unprotected sex on the 5th, and protected sex on the 7th. I have been having headaches, mild cramping, increased cm, constipation and the feeling of butterflies in my chest and abdomen. Are these side effects of stopping the pill, or possible early pregnancy signs?!