10 weeks 5 days breathing problems😩

This is my 5th pregnancy and I’ve never had this happen before but I was walking around shopping but all of a sudden it’s like I couldn’t catch my breath and my heart was pounding away and I felt like I was going to faint. I wasn’t walking fast and it didn’t start in the beginning of shopping it just all of a sudden hit me. It all happened last night but I woke up feeling like I still can’t catch my breath😩 has anyone had this happen before and what should I do?!