I've had many early pregnancy symptoms in the last week like nausea, headaches, twinges and pinching in lower abdomen but every test i take is a

, last one i took was this morning (10 or 11 DPO) and still

.
Well tonight sometime i started what is 4 days too early to be my period and it's not accompanied by the usual cramping (which honestly i could usually describe as mild labor contractions they get really uncomfortable) but this time they are just mild and more like the pinching i've been experiencing!! anyway what i'm having seems to be brown spotting there isn't much of it so could this be implantation bleeding at 10 or 11 dpo?! I think I would have ovulated on May 25th or 26th (i felt cramping around this time) and my expected period is not until June 8th or 9th!
what was implantation bleeding like for you if you experienced it?