Am I pregnant? or miscarrying? or overthinking?

So, I had symptoms of being pregnant for over a couple of weeks, strange cravings, swollen/sore breasts, mood swings (I'm not one to usually cry over food but I bawled my eyes out because my fiancé wouldn't get me a waffle😂), morning sickness, etc. I figured that it would have been too soon to even take a test, but my fiancé swore I am. Then Thursday, at work, I had severe pain in my lower back, that it even hurt to walk, then it started in my abdomen, then stopped, I unload trucks so I figured I had lifted something the wrong way. I went on about my day, everything was fine. I got home from my fiancé's house and I started to bleed very lightly. And the next morning I woke up and I had a lot of blood. I wasn't due for my period until November 1st. 
I've matched up every symptom of a miscarriage to what I've been experiencing, and it describes it to a "t". 
I need advice.
I hope you all don't think I'm full of it. I'm very scared.