<s>[INST] Hi I am getting my LH sugar negative ? why so My last period was on 29th March and my cycle is about 31 days.so accoring to ovulation calculator my ovulation is on day 17th (14th april) and most fertile day 16-18 (13,14 &15 april)but all these 3 days my LH sugar was negative .  Can you please guide me on these matter [/INST] Hello. Thanks for writing to us. It is not necessary that you must ovulate in every cycle. If the LH test is negative it means this one is going to be an ovulatory cycle for you. The delayed ovulation is also a possibility. An ultrasound scan will help in confirmation. I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/ Chat Doctor.  </s>