Use of martingale strategy

Wasnt even martingale. It was my bias to the sell position on thrusday. I took a sell position on eur.jpy for 2.00 lots less then 5% of my account only because the pair increased over 100 pips before the conference. once the news was released it dropped quickly thrn spiked up. my first position i held for a 80 pip loss. then kept adding. of course it never dropped. lol so now im in two new accounts using nartingale but sticking to my sl no matter what.