I'm there with you Carla. I swapped mouthpieces a lot early in my playing. Started with a 7C because that's what the band director said to get. When I wanted to change after 2 years, I tried a 5C, then 1 1/2C, Shilke 11, Shilke 14A4A, Shilke 13A4, eventually landing on a Shilke 14A4. I swapped like every month thinking that was more than enough time to adjust. When you make small adjustments (like Shilke 14A4A, Shilke 13A4) you can move pretty quickly. Bigger changes you'll want to give your embouchure time to adjust. Of course now I'm thinking of playing around with Wick mouthpieces as I have one on my flugelhorn.
If I may, could you help me understand what gear you have now ? How long have you been playing, what mouthpiece are you on now ? And most importantly, what trumpet are you playing (model and bore size) ?
Here's a mouthpiece guide I found if it helps: