If you in the US, you’re primary care doc’s office wil havel an after hours number to call if you’re not sure. Unfortunately you’ll likely be told to go to the ER if it’s heart related because we have to err on the side of caution since we can’t evaluate you very well over the phone. Urgent cares are hit or miss since they’re staffed mostly by mid levels who may or may not be well trained but they can handle sore throats/colds, simple cuts/infections/foreign objects, STD testing, etc. depending on their facilities. I’ve been to one without basic labs which is crazy. I’d suggest calling you doc’s office first to see if they have acute visit slots that day. A lot will.