Price the loss at a strike touch. Ostensibly the strike was chosen either via delta or you figured it was the smallest credit you were comfortable shorting.
Price a strike touch on day1. What's the loss? Solve for the spot required to breakeven at the strike and then mitigate with volcorr and skew assumptions. Or price it out a week, whatever your expected hold is, then substitute with one tenor a week inside the one you're short (shorting 5/19 and what-if with 5/12). Quick and dirty pricing on a one week hold.
Your upside calls will rally in vol to skew, absent vol-corr (OTM gains vol to moneyness and loses vol to mkt as it rallies). In this vol-regime skew will have more impact than vol-corr, especially if the strike trades ITM.