Since you're new to it, this overview might be helpful: https://clusterbusters.org/forums/topic/6213-basic-non-busting-information/. At the end of that post you can read the basics about busting, which is why this site was originally created.
How much D3 are you taking, and are you taking any other supplements with it (calcium, for example)?
Yes, that's how it works for most people. That's one very good reason to optimize the resources you do have (D3, oxygen, triptan) and be sure you know what else is available to you.