Bfp, bleeding, bfn!!

Lauren
Hi just wondering if anyone can shed some light. I think I may know what it is but any advice or if anyone has been in a similar situation would be good to hear from you.. 
I got 4 bfp on Monday & Tuesday, on Wednesday took a clear blue which said I was 1-2 weeks. This morning I went to the toilet and I had started bleeding. My period would have been due today and read it is quite common to bleed around the time you are due your period. I had a strange feeling so took another digital and it came back not pregnant. Have I had a chemical pregnancy?!