so it's actually not a bad buy despite losing steam. Just hope you didn't buy ATM. WMT seems rangebound 130-134 prior to ER but there is some risk here.
I would say a retrace to the 21DMA is more likely than a continuation above 134 at this point. However, it's hard to say. The IV:HV = decent time to buy and those 135s are ~32.6% prob ITM. if the delta drops below .20 then you might have an issue but it's not a bad trade tbh. I will say that you probably should have done a 135/140 bull call. sell the 140s so that you could hedge some risk. a 5pt spread trades ~1.20 vs buying the 135s naked at 135.