Late period, negative pregnancy test

So I'm on my fourth day of being late and I took two pregnancy test both coming back not pregnant. My period isn't like clock work but I've never been this late either. I also notice the day before my due period I 100% felt like I was getting my period. I felt like I was hit by a bus. Still no period but notice a lot of white creamy discharge and a lot of bloating. Started having some tenderness in breast today. My last pregnancy I was ttc and took a test the day I was suppose to get my period and had a positive test. I was barely 4 weeks and had a positive. I'm so confused