baby fever help!

I am having baby fever like crazy. Has this happened to anyone else? My mind tells me you're not ready yet you're only 21. But my body every time I see a baby or someone who is pregnant is like NOW NOW NOW NOW! I don't know if it's just me  freaking out a little not knowing if I'm fertile or not and miscarriages run on both sides of my family and same with ovarian cancer. I don't know what to do. I just randomly get sad or even angry because of it and it's the hardest thing to change my mood after it. Help please tell me I'm not the only one who has felt this way!!!!??