Is it a good idea to wait 6 months before I get another tattoo?

I just turned 18 on the 4th and I already have 2 tattoos. My mother (who I no longer live with) suggested/told me that I should wait 6 months before getting another one. At first I mindlessly agreed after being under her rule for 17 years, but now I’m starting to wonder, if I have the money, why shouldn’t I get another one? Do you think there is some reasoning behind her suggestion? What do you think?