I checked my account statement today and to my surprise I found out that I had a trade on. So I thought wtf is going on here and tried to find out what is happeninig.
Looks like I forgot to cancel a stop and was filled one day ago!
Luck was on my side this time, closed the position at +100 pips

.
I'm trading very small right now so it wouldn't have threatened my account even if the trade was without a stop, but would have beaten myself up about it, which is the right thing to do.