Pelvic Pain? Anyone?

So I just started working out a little more intensely and I'm taking Hydroxycut. I drink lots of water and green tea and eat meals and snacks, not starving myself or anything. I am on the Depo shot as my birth control method (sorry if TMI). I gave birth to my first son in August 2012.

Im worried because I have this pain in my left pelvic area, its been hurting for two days now and tends to be worse when I strain and in the morning when my bladder is full. Its kind of a sharp pain that comes and goes. Its hurts when I put pressure on it. My husband says its probably just sore from working out but I'm still worried.

I know that only a doctor can truly diagnose this, but just wondering if anyone else has experienced this?