Weight loss on the pill

Okay so I’ve been on the pill for five months and my weight has fluctuated all my life however I’ve recently noticed that it’s starting to stay on. I’ve been changing my diet habits these past 3 weeks (fruit & salad mostly). I have placebo pills at the end of every month so that I can get my period but my last cycle, I didn’t take my bc for a week after my period. I’ve also started seeing a noticeable difference in my weight but idk if it’s from changing my diet or not taking bc for two weeks (the week of my period and the week after). I guess my question is how immediate would weight loss come after no longer taking the pill?? Does the weight even come off?