Help!

I've been going pee nonstop lately and its a day before my period is suppose to start, also I've noticed my boobs changing a little bit they are heavier, fuller, and their are blue veins showing through them like really blue and their are some veins that stick out/putrude from my skin more around my nipples, also both nipples have brown rings around them and seem to be darker midday, and I have noticed pimple like bumps more then the usual ones appearing on my nipples and the ones that already exsisted growing/ showing again more. I tested and got a negative could it be too early to test could I still be pregnant?