Period 2 months late


My husband and I have recently started trying to get pregnant. I'm usually late with with my period but not this late. It's been almost 2 months as of Oct 6th. Every week I take a pregnancy test and it comes back negative. I have some symptoms of either my period or pregnancy (since there so simlar I can't tell) I have cramping and nauseousness, I'm usually always tired and last week I had some very tiny round spots that looked a little darker then blood on my underwear. It only lasted about a day and a half. I'm so confused and frustrated with the negative results and still no period. Has anyone else had this same problem or does anyone have any advice for me?