I was currently using a birthcontroll pills, and i was prescribed an antibiotic(cyphalexin) i took antibiotic 4 times dayly almost 20 days.( due to the swelling and bruising on my injured wrist). My period usually comes on time. my first day of my last period was on May 31st 2007(thursday) i took my white
pill on Sunday June the 3rd, On Monday June 4th i started taking my antibiotics, and by that time my period was gone. On Wednesday my period came back and stayed untill thursday.