Please helppp

Zoe • Happily engaged!
I just started birth control about 2or 3 weeks ago, about a week after I went a day where I couldn't eat because I threw up all day, 2 days ago it happened again and I've felt like shit ever since. My period started as a,browish discharge and then actually started turning red and I think I've been on my period for like a week or so. Is this normal?