Throwing up blood at 28 weeks pregnant! Normal or no?

I’m 28 weeks today & I woke up feeling sick like my throat was so dry & I thought it was because I was dehydrated so I drank some water & it got a little bit better but I checked my throat & it’s not swollen, it’s just red like irritated looking. I’ve been feeling like I am coming down with a flu but mostly my throat hurts & I feel light headed & that’s about it. Well I went on about my day & ate something then a few hours later, I felt like I was going to pass out & had to throw up so bad, so when I did there was blood, it was very light pink & I didn’t have the metallic taste in my mouth & no I didn’t eat or drink nothing today or yesterday that was red or pink. I didn’t call my OB because I didn’t feel the need to but now I wish I did because now I’m worried & I don’t want to take a trip to ER if not necessary & my OB doesn’t have a 24/7 nurse line & I already know if I call ER line they will tell me to come in. Anyone ever experience this?