yellowish color discharge could it be from pregnancy?

My husband and I are trying to conceive. I have been off of depo provera for about a year now. I finally received my period in November, so I thought that things fell in place at the perfect timing. However, in January and February, my period came early. In January, it came on the 17th, and in February, it came on the 13th. This struck me as odd, because it normally comes on the 20th like clockwork. Another thing that struck me as odd is the fact that I've been having this yellowish color discharge since my period went off. (About 2-3 days now) The discharge isn't associated with any pain, so there's no painful urination or anything like that. There is no foul smells, cramping, or anything else associated with the discharge. It's especially bad at night. Could you point me in the direction of what this discharge is or may be from, could it be from pregnancy? I took a pregnancy test last month and it came out negative, and I wanted to wait until the last of this month to test again.