Trying after a 17 week loss

It's been 4 months since my loss. We haven't been successful in getting pregnant again yet. I'm a week away from getting my next period or I could be pregnant. The past few weeks I've had a lot of symptoms and today I possible have a new one. Last night I had some cramps and today I have light bleeding. A test says negative but could it be implementation bleeding? I'm never a week early for my period. I never had this with my son either. I've tried not to get too excited but I'm kinda going crazy .