I just want a baby...

TTC is making me so depressed and I can't stand the way I feel. Every time AF comes I feel like something is wrong with me and I just want to give up but my desire for a baby is so strong I can't stop TTC. I have wanted to be a mother ever since I can remember and I always felt like I should wait until I was ready but since I found out my great grandmother is dying and I have PCOS it makes me feel like it's now or never. Im too scared to wait. Rant over.