Ok, quick background, periods always irregular, 2 years ago saw gynae who was fab, blood tests showed hormone imbalance, and he thought my lifestyle (fly a lot) combined with low bmi would make conception tricky. Referred me to fertility whizzes. Never needed the appt as was pg within few months . Now have ds and thinking about no.2 but havent had period since first week jan(not pg as coil fitted tho due to be removed.) Periods last up to 2 weeks. Total pain and dont want to go through referral system again. My new GP seems to think exercise once a week'll do it . but wondered if based on 3 monthly cycle roughly when best dates to conceive. Thanks in advance.