New Birth control - did I do it wrong?

Emilia

Recently I went to my OBGYN to switch birth control, as I was having a lot of spotting and side affects. My doctor stuck me on a different BC. I read the directions as the new BC stated to wait a week before starting on Sunday. My other half, we had protected sex, but I haven’t gotten my “period”...I bled what will be almost two weeks ago, like constant spotting. I’ve taken pregnancy tests but they are negative. So I’m a little worried.