implantation bleeding....

I'm 5 dpo-ish and I'm pretty sure I'm experiencing some implantation spotting. My lower back started hurting last night and has been hurting all day! This has been my first cycle on clomid! I'm trying not to get my hopes up too much, but next week is our anniversary and it would be the best present ever! So many prayers and fingers and toes crossed! We have been trying for 19 months...