HMM: Is the Blood Clot Risk From Birth Control Reversible? “The absolute risk of getting a blood clot while taking birth control pills is low, but it’s not zero. The risk can be higher depending on several factors, like the type of birth control pill you take as well as how long you’re taking it. A new study suggests that when you go off the pill, your risk of getting a blood clot might go down sooner than you’d think.”

Honestly, 2-4 weeks is about what I would have guessed off the top of my head.