I was on depression & anxiety medication when I weaned off meds pre-pregnancy and during most of my pregnancy. I'd say I was 6 months weaning off the meds and the pill. I got pregnant very quickly, the 2nd month trying.
And though there were hormones at play for sure, I did not get any of my creativity back, which sucked, and it's not like I had a leap back with my intelligence either (though it is common to get "mommy-brain" when pregnant, making you forgetful and feel like you have less cognition; it's a real thing researchers study and all). I was even worse off meds. Of course, I was diagnosed with post-partum depression almost instantaneously after the birth. I was very depressed a lot of my pregnancy, which caused the OB to prescribe me Zoloft and Xanax the last month or so.