Please someone help a chick out! Sooo confused.

Last Tuesday I started with this light pink spotting that last 3½ days. I would only see it when I would wipe and it would be a small amount only and had really mild cramps. AF was supposed to start this past Tuesday and didn't come. Wednesday I began spotting again,Thursday a really light period began and still today and I see it when I wipe only. Has this ever happened to anyone and has anyone found out they were pregnant after it stopped. I'm not having any painful cramps at all that I normally have and its not heavy at all.