From my experience. spotting can be a sign that your period is starting or old blood from your last. Most spotting is mainly a light pink that can be implantation bleeding that usually happens 7-10 days after you ovulate. I have pcos which causes the word pregnancy to be thrown around....i had unbalanced hormones and that can make you think you are pregnant with all the symtoms and the spotting. a late period can be due to stress, change in lifestyle diet. Take a pregnancy test 2 weeks after your period would have been due. Sometimes the first few days after you missed period will give you a negative, than a blood test to confirm. Hope that was helpful