To take a pregnancy test or to not

So today I just realized I had unprotected sex two days back to back while I was in my fertile week. On the 1st and two times on the 2nd . A couple of days later , I would say on the 4th I had cramping but its weird to explain it was a different type of cramp. Not sure if I should take a test because it could just be my body going through a change because this year my breast have also started to become sore when its around that time of menstration. Even if the test comes out negative I feel my mind would be at ease but should I take one???