Calcium pills

Okay, so i got the depo Aug 6th. and for about 4.5 weeks now ive had heavy heavy bleeding. On & off though. Somedays its light but mist days its heavy.....Lets just says ITS ANNOYING!  my doctor prescibed me calcium pills when i first got the shot. Also in advance its my first every form of bc and my first shot so yea. anywhooo. I only took like 3 pills. 1 a day. And it made me have diarrhea really bad. But if i started taking them again could the bleeding stop or atleast be lighter?