Am I pregnant?

Hayden
I had sex on October 7th and I was past the fertile window, I took econtra ez 4 days later and had minimal side effects. This past week I've been feeling different, I feel tired and hungry all the time, in addition to being constipated, and I feel heavy/full. my period is 5 days late and I'm really concerned. 
Could I be pregnant? If so are there any natural methods I can take right now? Help 😭