Aching backs of leg?

So I'm 4 wks pregnant. I have some aching in the back of my leg/knees mainly on the left side...thought I sometimes feel it in the right just not as prominent at all. Of course I googled and it told me I have blood clots. I'm young and don't have any family history but now I'm freaking out 😩 anybody had this before while pregnant? I can feel it ache sometimes up to my butt lol