Hi mama! Congrats sa pregnancy mo! Left side pain during pregnancy can be from a lot of things, ligament stretching, gas, or how baby's growing, pero since you're at 17 weeks and it's going down to your groin area, mas better na i-check mo with your OB para sure lang, especially if it's sharp or keeps happening. A few of my mum friends had similar pains at that stage and turned out normal lang, but walang dapat i-risk with pregnancy kaya go ahead and ask your doctor sa next visit or kahit sooner if it gets worse!