Tmi with pic. What's going on? Thoughts?!

I'm on cd 45. A blood test last week tues was negative. Yesterday I started having cramps that have gotten a little worse today. I've had some light spotting. Like all day one liner just a bit of pink. When I went to the bathroom there was a clump of clear cm  in the toliet with a small streak of pink/ red. There have been a couple sharp pains throughout the day. This can't be my period right? Wth