I was on depo for 3 years I missed my shot in September and I'm having pregnancy symptoms is this normal

You can get pregnant any time you have intercourse, even on depo. Considering your missed your injection you have increased the risk.

Wow even if u didn't start you period back yet?

It's possible. I've known girls who have gotten pregnant on depo without ever having a period on it.

Remember that there is no method of birth control that is 100% effective.

Oh wow I'm having a lot of pregnancy symptoms like nausea going to the restroom a lot and more is that normal when missing a shot