Is this normal?

Naw
Hi I'm 3 weeks pregnant according to clear blue I have a few confusing bout those hcg level on the pregnancy tests first I took them with first response and got both dark lines a week ago and now I still get 2 lines but very faint line is it normal? N my nipples are sensitive but not as much I had a miscarriage before cos of ovarian cyst rupture but everything was fine. I exercise and in my final year of uni and newly engaged too!! Lolxxx