vaginapagina | chance of pregnancy? (Reply)

So I'm on a pharmacy brand version of Alesse called Aviane.

I skipped my week of placebo pills on my last pack and went directly on to a new pack to delay my period from arriving at an inconvenient time. I took about 4 pills from the new pack and then on the 20th decided to go off them for 7 days to allow myself to have a period. On the 27th I continued with that pack and last night, the 28th, had unprotected sex.

So my question is, should the birth control be reliable in this case or should I be considering the morning after pill?

Even if the birth control wasn't effective, I shouldn't be fertile right after my period right?

Thanks for any help :)