Question about clearblue fertility monitor.?

im currently using a cbfm. i generally have 5 days of high, 2 peak then 1 more day of high before returning to low. this month hubby and i bd every night whilst on high but didnt when on peak due to work. so we last bd the night before my peak days. could i still conceive from that considering sperm survive for a few days. we are also using conceive plus. any comments would be fab