Sold right at spot

I bought 1250 shares of PBYI yesterday and price dropped $2+ and paper loss $2400+

I was panic because it was a sell off,  I did not even have time to put stop.

The tendency last time was when price drops,  I just buy more and continue buy more and eventually bought 4700,  and paper loss was 8000.

So this time I bought much less,  only bought 3 times.  500 once,  then another 500, then it dropped too low,  I bought 250, in scaring if continued drop.

Later on,  I asked Fidelity,  they said you can use conditional trigger, when 1st order triggered and filled, trigger the stop order.

This morning I put on stop at 69 to sell 1250 shares,  I know when market open it will have few minutes of high time. I put on 69 and which is above yesterday 67.97,

When market open it jumped over 69, made 1000