Yes it sounds like it could possibly be implantation bleeding. I started spotting about a week before my perios was due and I thought it was just coming early but it didn't quite start the way it usually did (to make a long story short I am still bleeding for about 2 and half months now but my baby is still doing well) I went to the doc because of what I thought was an irregular period and found out I was pregnant.
Since I didn't think I was pregnant I ignored all the little symptoms I was feeling like peeing a lot, sore boobs, fatigue, even nausea.
Your symptoms do sound like you are pregnant though I guess all you can do now is wait and find out if you do miss your period and test for it a few days after to make sure.
Good luck!!