I saw this posting
Per Sentimentrader: When SPY was down at least 4 days into the Mon following an option exp it rallied 9 out of 10 times over next 2-5 days.
I will keep this in mind next time. 94% chance of winning but win/loss is only 0.23 but then it is the only losing trade out of 16. (I used only 4 down days)