Late period

I have now pushed back my period start date twice on glow!  My period is now a week late!!! I took a test this morning and got a BFN.  Is it possible to have gotten pregnant right before my period was to start and maybe it is too soon to test??? 4 days before I was supposed to start I felt cramping,bloating,gas like I normally do before starting.  Breasts are heavy and can see veins.  Thanks for your thoughts in advance!