Possibly pregnant or in my head?

We are TTC and have been having sex regularly. My fertile window started last Friday and we have had sex every day since then with my peak days being Tuesday Wednesday  of this week. The past couple of days I have been so nasaeus, emotional, and crampy. I know it's unlikely that I am pregnant but my period isn't for another 14 days so it's too soon to test. Is there any possible way I could have conceived last week and be feeling like this this week?