After hours is such a circus. Poor liquidity, avoid it unless you absolutely know what you are doing.
I still remember that GOOG afterhours session when it suddenly gapped down 90% and a few hundred shares exchanged hands because someone misplaced the decimal point and others jumped on board in a frenzy.
My strong advice is to trade during regular hours, after the market has been open for at least an hour. Best time to open positions in my opinion is near market close