Possible pregnancy signs (not sure)

Destini

I really need some advice. So my period is currently 6 days late. I been having some cramps before my period was supposed to start and im still having them in my back here and there but it goes away. The other day I was constipated for a while. I haven't experienced any other pregnancy symptoms yet but I did take a test which was negative. Was it too soon to test? May I be pregnant? When should I retest?