Ok so every month I have a regular 4 day cycle on April 20th I bleed which I'm like ok I started perfect timing because that is when I was due anyways well the bleeding only lasted till the 21st when I woke up on the 22nd there was no more bleeding but then come the 24th I was lightly spotted and this just has me confused because my periods are very normal and on time and only last 4days. Any suggestions as to what happend in april