What am I doing?

I m in early pregnancy stage now and feeling all the time tired, unable to concentrate and the only thing I want to do is sleep or eat. 
Before I get pregnant I was trying to find a job unsuccessfully and now that  I am I can't even keep looking.
Also whenever I m too active or too stressed I have brown discharge. So I'm afraid to be very active but I start feeling so useless.
I think I will be like this forever. I think I will never work or do anything with my career.