HELP!!! I'm having pains 😭

Sooo.. I'm not sure if it's from the baby growing and stretching cause I did start feeling my baby move a lot more kind of like little kicks every few minutes, I'm 19weeks. But I've been having almost like sharp pains in my lower left side way in the corner from my pelvic bone to my left leg and I been using a heating pad for the pain but this has been going on for a day now and it's constant so idk if it's a the baby at this point or not :/ is this something I should be afraid of and go to the ER right now?