So I've been thinking about getting on birth control for a while now, but I just recently realized I needed it. my boyfriend and I use the withdrawal method but 6 days ago he didn't pull out fast enough. we went to the store immediately after to get plan b. after this I decided to get on the pill, and I was planning on starting tomorrow but my period doesn't come for another 12 days. should I start from day one on the pack and wait another month for my next period? im just worried that the morning after pill didn't work and I'd like to know sooner than later