Lump in thigh.

Hello everyone, 

Im 24, a mum of 2 boys ages 3 and 1.

About 2 weeks ago i discovered a sizeable lump in my thigh, i can see it all the time, but its much more pronouced when im climbing stairs or tensing my leg muscles. Its not directly under the skin, but it seems to feel like its more underneath or inside the muscle of my thigh. It doesn't hurt, its hard and does not move. 

I went to my GP who said "Firstly, its your leg. Not much can go wrong there" he then said i think you might have torn your muscle. I laughed slightly, because i explained i dont drive, and i cant get out my house because of that. I also have 2 young boys to raise so i get no time to go out excersizing, there is not a lot of reasons why i could of torn my muscle, besides im sure i would have noticed as i believe that would be painful?

He agreed and said yes it would have been painful so it might not be muscular. He has refferred me for a ultrasound to see what this lump is. But the ultrasound appointment isnt for another 2 weeks and im quite worried about leaving it so long if it is something sinistar. 

I don't know how long it takes for a tumor to grow, if it is a tumor thinking in worst case senario. But this lump appears to have gotten a bit bigger in the last 2 weeks and its getting unnerving.

Can anyone relate to this story and tell me what happened? what was your outcome? thank you