Period and still be pregnant?

Okay so I need some advice..so my period was due the 27th I had nothing all day till evening around 7ish. Now normally I spot the day before I'm suppose to start never the day I'm suppos to start. I ended up starting the 28th in the middle of the night and my cycle was normal for first 2 days and then on 3rd day it got light in the evening now that's normal and it  as light the rest of my cycle of which is normal sep for it was a little lighter then normal and my cycle was 5 days long. My cycle is never ever have been 5 days long! And the only time I have been late is when I been pregnant. Is it possible to have a period like this and be pregnant? I was thinking of testing but idk..