Can your aerolas get darker and larger?

I’m on the depo provera shot. I took it on January 30th and then had my period until February 4th. I had unprotected sex and he came inside on February 18th. I am not bleeding, I don’t have any discharge that would necessarily look like cervical mucus. It has been a week now and I’ve been really nauseous and having bad headaches but that’s most likely from coming off my antibiotics. My aerolas are darker and also larger and I compared it to a photo of my boobs from December 2018 and they were small and light pink. Is this just that my hormones are changing and it’s causing my aerolas to become large and darker in color? The depo shot is extremely effective because it makes your cervical mucus thicker so the egg can’t pass through. It also prevents ovulation from happening. I really don’t think it’s possible but I am kinda confused. Should I watch out for any symptoms of pregnancy? Or is my body just tricking my body by creating symptoms of pregnancy? I really doubt it, I need to know someone’s opinion who actually is pregnant and knows the early symptoms.

(P.S please don’t be rude or anything I am just curious. I know all about pregnancy but just not this specific symptom I am experiencing)... please comment any thoughts :)