Fallen Into an Anxious Spiral

So here’s the long complicated story: A few weeks ago I had sex (protected with a condom, and he pulled out before he finished, and it literally only lasted maybe 30 seconds before he came) and I got my period a week later and my period lasted for 5 days like normal. I’ve been having a ton of anxiety over a bunch of different things in my life and starting taking antidepressants yesterday for the first time. I’ve had very strange GI symptoms like bloating, gas, and a rumbling empty feeling in my stomach almost like I’m hungry even if I’ve just eaten. I don’t know what’s causing these symptoms, but I’m pretty sure it’s anxiety. I made the mistake of googling it, and every result has pregnancy listed as a possible cause. I’m now in an uncontrollable spiral of anxiety over this. There’s no way I could be pregnant because I got my period a week after having protected sex and my period was completely normal, right?

Could I possibly have an issue with insulin? Or is it just anxiety? If you have any ideas or know anything about this, please help me out. I’m in a spiral.