Early period on Clomid???

Barbara • Trying for baby #1! Married summer of 2014 and started TTC March 2015.
I'm on my second round of Clomid and my period came super early. I thought Clomid would lengthen my cycle? My first round I got pregnant but unfortunately I miscarried so I didn't know how long my cycle would be. I thought it might be implantation bleeding but I think it's too heavy now and my HPT was negative. Has Clomid made anyone else's period come early? I'm so bummed and confused.