Trying to conceive around a crazy work schedule

Hey ladies my boyfriend and I are of course trying to have a baby and it's been a long 4 months almost 5. Part of our problem is he works 21 and 21 on an offshore rig and misses a few of the main days or weeks all together!  Any other ladies working around a mans work schedule and their ovulation weeks?  I just recently purchased preseed and started taking shots of brags apple cider vinegar to increase our chances. Any other helpful tips on how to increase our chances since our schedules are already working against us ?