Really confused; please help

[MissMymmy]

So my period was a day late and I was obviously upset when it arrived. However it's not been like a normal period. Although I had back ache the two days leading up to it, I've had no period pains and it's only lasted 3 days when it normally lasts 7 days. The first day was light and it was heavy yesterday but then light again. I had negative tests up to the day before I was due
Om

 

[OnErth&InHvn]

it could just be a light period, it does happen and is normal