Taking fluconazole...

I have a question about taking fluconazole for a yeast infection and bleeding.

So I took fluconazole on a Friday (1 pill) then took another pill on Sunday and that Sunday night I started bleeding. My period wasn't due for another 4 days. I had a light period for a total of 4 days. My period usually is very heavy for the first 2 days then somewhat light for another 4 days. We are trying for a baby and I'm wondering why my period was so light and early? Was it because of the medication, implantation bleeding or something else?