"In DMD chapter 4, the Martin path will only be available to continue if you chose the options "Ask Martin" and "Have sex with Dee" at the end of chapter 3. If you have the Martin path unlocked but didn't make those choices, the path will end early in the new chapter."
Hmm... Dee doesn't take the pill, and while playing the Martin path, Martin is the first one to nut inside her after that. And to keep Martin path going in Chapter 4, you must choose Martin to have sex with Dee... So some interesting possible plot twists available here considering what you chose, eh?