Missed Chance?

Aine • Married May 2014. Expecting our Baby Girl on 29/06/2015

Hi All

I am currently following the SMEP plan, where I bd every other day from cycle day 10, once I get a positive opk then bd for 3 days straight, miss a day, then bd again

I have been hectic with work this month, and it is now cycle day 12 and I haven't done any bd'ing or opk

is this seriously going to affect my chances or am I still in the running? usually get a pos opk around cycle day 16

thanks