Advice

So I was suppose to start my period today but it came two days early so I thought, when I went to the bathroom 2 days ago there was blood in the toilet which I thought was my period but when I put a tampon on there was barely anything and it’s been like that for the past two days and my flow is usually heavy with lil cramps I feel the cramps but very light flow so I’m getting worried has this happened to anyone could this be implantation or just a slow start period