no not this time i tried it my little man last time. I got an opk+ on the usual day but i got a temp drop the day before (neg opk) and four days later neither of which seem to fit with o so didn't bother this time, that and i'd lent my thermometer to a friend whose son was ill and with my littlest i never seem to have a chunk of sleep anyway at the moment he keeps waking up about 2 or 3ish so never asleep that long before i get up