My husband and I have been trying to conceive since June. We got pregnant the first cycle trying and then found out it was a chemical pregnancy on August 20th. I started using OPKs this month to see when I ovulate. I usually have a 28-30 day cycle. It is now cd17 and I still haven't gotten a positive opk. Is it possible I could have a luteal phase defect and that could have been the reason for my chemical pregnancy in August? What's the latest I can safely ovulate? Should I just stop stressing about it since I've only been trying for 4 months or should I go see a doctor for testing?