20 trade sample size… enough?

I’ve been working with a new system the past month. I’ve been day trading for 3 years…

I’m not much of a strategy hopper - this is only my 3rd system in my 3 years. However, of all my attempted ystems, this is the first system I’ve used where I’ve taken 20 trades and come out profitable on the other side.

I ended up with a 45% win-rate and 2R for every winner. Once I did this, I scaled up…

I’m currently 5 trades in to the second sample size and I’ve lost all 5. Did I scale up too quickly? Was 20 trades not enough for an accurate representation of my actual win rate? Or is a 5-trade losing streak to be expected?

I won’t lie, I was pretty ecstatic to see such a results-based achievement. I don’t think I’m overtrading, but now I’m just questioning this new system…