Heavy but inconsistent spotting?? Help!!!

I'm 4w4d pregnant, af is on day 5 of being late. Had a bit of what I believed to be Implantation spotting yesterday afternoon (wiped pink and only lasted 2 hours) but I woke up this morning there was a little bit of blood. Heavier than implantation bleeding. I'm not having any cramp or anything but I've been having SuperPMS (which is not normal) for almost 2 weeks. It started with extreme irritability and mood swings. Then the breast tenderness. I haven't had any food aversions, just a dog like sense of smell and a craving for confetti cupcake pop tarts. I need some advice, or some insight!! Could it be a chemical pregnancy or just nothing to worry about?

Also, I took a test a couple nights ago but it was negative (then again it wasnt a LOT of pee) but my period still isn't here yet so I'm thinking its too early...but I'm almost 95% sure I have alook little alien in my tummy :)