Have been ttc now for 17 months - cycle is more or less 26 days, and I assumed that I should be bding on day 12 but do you think it would be possible to get pg by doing the deed on day 10 and furthermore for me to be experiencing feelings of morning sickness as early as day 18? For the last three mornings I have woke up with terrible headaches and today I have been feeling really grotty all day with terrible waves of naseau and no appetite (which is really not like me).