Hi! Just a quick question for anyone who has had spotting a week before AF was due!

I think I ovulated around the 15th of the month then on 23rd I started spotting- thinking AF arrived early. Then it went away untill the 25- I spotted in the am went away by early afternoon(when I rechecked.) Then the 26th same thing only in the am went away before noon...Then again today the 27th it was there again this am! Im not sure whats up since I have no symptoms of pg or AF...no cramps or sore bbs... I took a HPT yesterday but it was neg. Any ideas?