What Causes Brown Vaginal Discharge, Cramps And Headaches?

Hi I am 43 and have been trying to fall prey on and off for about 2 years. I had a miscarriage last year about Oct so we decided to stop trying and going back on pill. We then thought we would try again 2 months later period came the time it should last month. I was due last week 4 days late 3 days before had slight brown discharge only lasted 1 day now 4 days after period due I have brown discharge only when I wipe and its been about 2 days now and not getting heavier. I have cramps back ache headache and going to toilet a lot. Could I be preg or will my period turn up very late?