Hello, I always get my period on time, 28 day cycle and last between 3-4 days. I track them with a period tracker app that I have on my phone. This month my expected period was the 18th. Instead of my period I got what seemed like spotting from the 18th to 19th. Light pink and only when I wipe. On the 22nd I got my "period" but was way lighter with little to no cramps than my usual flow which is light but always heavier on the first day with moderate cramps. Only had to use one pad and tampon and a pad over night and for yesterday I used two. Should I be worried or is this normal ?