HELP HELP

So since about 29 weeks (I’m 35 now) I’ve been getting horrible leg aching and knee aching. feels like a growing pain or after a workout soreness. I get up a move frequently, but stay at home so I don’t do much during the day. Usually getting up and walking around relives the pain. I’ve been reading and am scared out of my mind about blood clots. There’s no sign other than the aching. Could this be a blood clot? I mentioned it to my doctor and she just said take magnesium, but it’s not really helping. It’s switches back and forth from which leg and sometimes it’s in both but it’s not constant.