Yes. The cramping is because your uterus and the ligaments supporting the uterus are stretching and growing. The cramps in your legs could be because of a pinched nerve or for other reasons I don't know much about.
You should see your doctor if you're concerned
I had slight cramping when I was pregnant with my son and they just disappeared - everything was fine. The 2nd time I became pregnant I had cramping, even down my leg (a little intense at times) and I ignored it. I wish I hadn't because I ended up in the hospital and miscarried. So....it is always best to call just to be sure. I pray that everything goes well for you and they will just go away without incident. Just call...you will feel much and won't worry any longer.