33 weeks and bright blood when I wiped!!

I’m starting to get very nervous as I never had this happen with my first child! It was a little line of bright red blood after I saw that I freaked out I kept wiping and wiping to see if I saw more but nothing! I took a bath to relax...and just want to know when I should call doctor? My friends say if I see it again to call doctor! I feel baby moving and it’s been an hour since I saw the blood... please mommies give me some advice...should I call dr...or wait to see if I see it again and go to l&d;