Progesterone help

Emily
I haven't had my period in 3 months. (since the end of December)I recently went to hospital for body aches and for throwing up. They said it was an undetermined viral infection. And the only thing that was off about my tests done there was that my platelets are very low. They also gave me a pregnancy test and it came back negative. I then went to my gyno and he had me take a blood test. Also negative so he prescribed 200mg of progesterone. I was wondering if anyone else had a similar situation. I start the script today. 
I'm very worried, I am getting married 8/15/15 and plan on having a child immediately. (That why I really wasn't worried about not having my period, I want a baby) I am reading a lot online (I know... Shame, shame) and I am seeing a lot of early menopause and ovaries that just stop working. Or the pcos?  I'm sitting here crying my eyes out thinking about this. 
It just really bothers me that everyone  doesn't think I can handle having a baby, other than me and my fiancé. We've been together for 7 years! And we are both 26. 
I really just needed to vent and see if anyone else has gone through this? 
XOXOXO 
-emmajean