[supertofu]

I've used fertility awareness (see https://www.tcoyf.com/) paired with a short course of Queen Anne's Lace tincture as a fallback if intimacy should happen during the fertile window. A fertile window for those who ovulate is usually only 2-3 days, with a couple days padded onto either side of the window for extra security. I've been using this method for five years and have avoided pregnancy thus far.

Fertility awareness requires a great deal of mutual trust, and a great deal of understanding of one's body. It is not 100% reliable (although the media would have you believe this method is only for religious zealots and the irresponsible, which is very much not true) -- but it's a lot less complicated than invasive surgery.