Confused !!!!!

Okay so a month ago me and my boyfriend in the heat of the moment started having sex without a condom and mind you I was not on birth control. The sex was not even a minute because I stopped because I know that is a risky situation. It was barely sex at all. I was on top and it was like two thrust at most. We stopped and that was last of it. We continued to use condoms until around the 10th of September I got my birth control shot ( depo ) . I had already been extremely nervous because I over think everything and always have this fear of being pregnant . Even when I don't have sexual partners my period is late and still in the back of my head think " what if I'm pregnant 😅 " I have never been pregnant , I just over think everything. And so of course with the unprotected " sex " I had , mind you that was only like a minute , I was afraid I was pregnant . The unprotected " sex " had been maybe three or four days before I got my shot. Everytime you get a birth control shot they give you a pregnancy test to make sure you aren't pregnant . I was so nervous and I almost had a mental breakdown. Of course my pregnancy test came up negantive  but since I over think everything I was thought in the back of my head I could be pregnant and its just too early to know from a test because it takes awhile for the hormones to kick in. That day I got my shot . Everything was fine and I stopped thinking about it . Now this isn't my first time receiving the depo shot so I know the side effect. They are bloating , tiredness , weight gain and whole bunch of other things . And recently as my birth controll is completely kicking in im am starting to get those exact symptoms . I'm a little scared though because most of the symptoms are very close to the symptoms of pregnancys . I'm starting to worry because I'm 16 and that is not what I want. Also I have had an extreme increase in hunger and Ive had strong craving too it's starting to scare me but that could be apart of the weight part , maybe ? I'm not sure . I'm just asking for someone to look at my situation from their view and tell me what I should do . Please comment !!