Well, this is only my experience with having a tattoo (fairly large of a dragon) around my calf and I got the tattoo about 20 years ago. I have, since then, been pregnant twice, worked out and not worked out. I haven’t paid much attention to the tattoo as I have gotten used to it like as if it’s part of my body…but now that I actually look at it, it hasn’t changed at all in appearance. The only thing is that the color red faded from it…but I assume that’s not from the weight gain and loss. I think that if your weight isn’t dramatically going up or down, your tattoo should be fine.