weird cramps

Ab 2-3 weeks ago I had some super light pink spotting when I wiped. After that I've had some cramping like I'm going to start my period at least everyday since then. I was supposed to start on the 17th. So I'm ab 9 days late so far. I've had nausea, dizziness, and breast tenderness just recently. We are TTC and we've had sex nearly every day this month. I took a pregnancy test this morning and it was negative. Today I've had some more intense cramping on my lower left side. Hoping I could still be pregnant...thinks its possible?