When do I ovulate?

It's 11:20pm on Monday night and I've just spotted EWCM. My husband is away until Thursday night so I'm distressed. If I ovulate in the next couple of days we would have missed our chance taking us to month 12 😞 I know it's a really broad question, but on average how soon after first spotting EWCM do you expect to ovulate? My temps have been dropping ever so steadily for the past 3 days, I'm only on CD12.