Am I pregnant??

I posted of here a few days ago of how I got the depo injection in January and how it ran out on the 12th April and I had unprotected sex every day till the 24th and now 6 days later I woke up this morning with what looked like a light period but it was just brown and haven't bled all day I've had cramps but no blood whatsoever so I was just wondering does this mean I'm pregnant??? And was that implantation blood ?? I haven't took a test yet as i think it might be to early I've now split up with my boyfriend as he's been cheating on me so I need to know ASAP please help