Is it bad that my ovulation days could possibly be changing to different each month? What does it mean? If anything. I've been using the Wondfo opk test strips and each month I was coming up with postives late day 13 day through 14 consistently with but this month it showed up on day 11 - 12. Any insight? I don't think it's related but I have had a really bad bout of asthma attacks and allergies the last 5 days that has made me feel really sick too but that's not hormonal so I wouldn't think that would change that would it?