Does Depo-Provera Change Areola Color, And Is It Effective For Pregnancy Prevention If Received Before The Last Sexual Encounter?

Does depo provera make your areolas chainge colour and can i trust depo provera. I am a stress case of a boyfriend and I dont want my GF to be pregnant. well not now anyway so can i be calm and trust depo provera to prevent preganacy. last time I had sex with her was on christmas and its now january 29th so is my gf still protected from depo. please answer me as soon as possible. And if possible can anyone just give me a full walk through on the breast effects of depo provera. thank you and plz answer me so that I can stop stressing about this. I am trying not to but In 2020 I had a pregnancy scare and this was before she went on depo provera. and it kinda messed me up in the head. Every time she says her boobs got bigger or there is slight discomfort and uterin contractions and pain my brain always jump to the conclusion that she might be pregnant. but then she is not so can anyone put my mind at ease.