No experience with that specifically, myself... but my current "deal" with DH might be of interest since you say that your DH would be fairly resentful if you did get pregnant at this point.
I want another. He wants to wait. I'm willing to wait (at least a little while), but not willing to go on hormonal BC or get an IUD at this point in my life.
Our "deal" is this: I tell him (without his asking) the first day of my period that I got my period. And, I honestly answer any questions he may have about my cycle if he asks. Oh, and I'm not allowed to tamper with or hide his condoms (not that that's something I would ever do anyway).
His responsibilities are to: remember when I told him I got my period (or ask if he forgets, but with the understanding that I might not remember off hand and will not stop the action to go find my agenda and look up the date), do the math regarding where I should be in my cycle based on the 1st day of my last period, decide just how much of a risk he wants to take (or not) and wrap it up or not accordingly, and be willing to assume any and all consequences of his risk assessment. He is also responsible for buying/making sure he has condoms on hand.
Basically, we agreed on a level of information that he is comfortable with, and the conditions for the transmission of said information. Then, I gave him all BC responsibility, before conception. If I do get pregnant, he knows we will be keeping it no matter what.
You might want to talk to your DH about a similar "deal", to take some of the pressure off you and give him some control so that he won't be resentful if there is an oops!