Femara Question

Vanessa
Okay Ladies...I've been taking Femera for a few months now and my cycles are right around 30 days. I'm now on day 40 with no signs of AF. I've been using OPK and I know I ovulated 24 days ago based off of positive OPK and CM changes! Has anyone taking this medication been over 1 week late for AF...10 negative pregnancy tests in the last week by the way so I know I'm not pregnant because I would be 5 1/2 weeks and the hormone would have been picked up by now(I've tried digital and just cheap ones)