Need some advice please!

I was due to start my period this month on the 9th, I had what I thought was my period last week, a week early. Going by my tracker I would have been about 10-11 dpo. It started on the 3rd and ended on the 5th, it was very light. Last week I noticed I was nauseous often especially when riding in the car. I've also been sleeping and eating alot. Today I took a 4 hour nap in the middle of the day and still feel tired. I've also had some tugging and pulling pains in my lower stomach and just a sore feeling in that area along with bloating. And of course the sore breast have gotten worse again. I'm really confused. I'm wondering if maybe what I thought was my period was actually implantion bleeding.