Pregnant?

So i’ve been on the pill for 5 weeks now taking it correctly, although the first 4 weeks were on a pill packet that was expired by 2 months (i spoke to my doctor and she said that shouldn’t be an issue) BUT

my boyfriend and i just had unprotected sex (both don’t have stis or anything) and he came inside me and i’m just wondering if i should go get the morning after pill or if i will be okay (i’m WAY to young to have a baby at the moment)