why do my legs hurt so bad 😩

I'm almost 14 weeks and my legs hurt so bad, especially my calf area on my left leg! I didn't have any leg pain with my first pregnancy and this is scaring me. I don't want anything bad to happen to my baby or myself! I do walk for a few hours a day, but I did that with my son also and I was fine! My lower back and left leg hurt the most. I'm still really early. Is this normal or should I talk to my doctor?