Early/Short Period

Rachel
My period came about 3 days early. 
Due to start 6/11-12. Started 6/9. 
It was light (for my normal periods) and is now already over-3 days long. 
I was sure that this was my month before this happened. I've been dizzy for a week and a half and nauseous on and off. Last week my boobs hurt for a day or so. That was a big sign for me, because I never get that with PMS. 
Could that have been implantation bleeding? If so, when should I test again? This is our 8th month trying so I'm starting to get anxious. 
Thanks for any advice!!!