What is going....

So I am on the mini pill and have been for years. I have weird periods but usually around 4 weeks between them. My last period ended 29th December and at the start of Jan I did miss a few pills and took some late. I have had the same pms symptoms that I usually have for the past 2-3 weeks. Back ache on and off and what I call ‘period belly ache’!!! Still no period..... I spotted so little on Saturday night and also Monday night but this was only when I wiped. Can a period really not come after showing signs for what feels like ages!!!!