Possibly 4 weeks and 4 days preggo

My periods are like clockwork . I'm never later it's either on time or early. I have a regular 28d/c. I was late for 3 days started spotting pink, following dark brown/red bleeding. It increased with cramping and later turned Pink-ish. Now it's back to the dark red and I have no idea what this could be. I had no sore boobs for the whole month and only dull cramping for a few days before the bleeding started. Anyone still remained pregnant after experiencing some type of medium bleeding like a period in early pregnancy?