8 Countries In South America Hi I'm On Triphasil For

8 countries in South America Hi I'm on triphasil for the first time since Feb and I guess I didn't take my pills correctly I started with the brown pill instead of red pill,now I don't see my periods for march until now I took a pregnancy test but it's negative i want to quit and get my periods so that I can start again I had 3 weeks using protection during intercourse , can I get pregnant if I can just stop now ?