Hi. I’m A 24 Year Old Woman, I’ve Noticed For

Hi. I’m a 24 year old woman, I’ve noticed for a week now when I go up the stairs or running or just doing a little work my heart suddenly beats hard. It lasts about 2-3 seconds then it beats normal again. I can’t really describe the feeling but it’s like a “whoosh” feeling that I feel in my throats also and chest. What could it be?