Worried

Alright so my period isn't due for another week. However I noticed two little things of blood in the past two days when I went to the toilet it just looked really stringy like it was weird, then a tiny bit of brown discharge . I had cramping yesterday and the day before and today it's just mild. The pregnancy tests are negative probably because it's too early or could that have been a miscarriage? 
I mean I've never experienced anything like that before in my life, either I get my period or I don't. I don't just have weird blood blobs in the toilet and nothing else a week before it's due... :/