Having a lot of white discharge and i know i dont have a infection what could this be?

i know it is not a infection because i was tested so could i be pregnant i mean the white milky discharge just runs out of me i actually can feel it and we have been trying to get pregnant i also been having headaches and feeling nauseated i did take a pregnancy test about 2 weeks ago they both was neg and my period last month was like spotting for the first day and a half then heavy bleeding for 2 days spotted brown for a day then spotted for 2 more days all days was in a roll as of my period was so 6 days and i have not felt right since any one have any ideal