Why is this happening to me !!!!

So i should of came on my period on the 27th but on that morning i had just a dot of light blood.. so i fort it might come on more when it gets to the night but its didn't. Ive only been spotting very light pink. i can't even say ive had 1% of a period i am on bc pills but last month November i did miss some of my pills .. as this happened to anyone befor !!!!!