Implantation bleeding?

I ovulated about 8 days ago I expect my period in the next few days and today I have light brown drops. I've also had a pretty bad headache the past couple of days and have been running to the bathroom. I was super nasous last night a bit dizzy. I haven't taken a pregnancy test yet me and my Husband have been trying since November and I'm nervous to get another negative. What don you ladies think? pregnancy implantation bleeding or just normal signs aunt foo is around the corner?