The facts:
*Youngest child is 13m not had period since falling pregnant with him.
*Husband had Vasectomy Jan but only got "all clear" finally nov.
*I was on Depo jab mid aug to mid nov during which time we had sex once 
. Not been active before or since due to lots of reasons but mainly having 3 kids!
*About 6wk+ ago felt all pregnancy with symptoms like metallic taste in mouth (like previous reg). Did test which was negative.
I am now having all the cramping feelings, legs hurt, beyond tired, at times v increased appetite, mood swings and now what may be spotting.
Is it possible to get pregnant on the depo jab and whilst waiting for all clear for husband Vasectomy? Or is it me being silly? HELP.