I have no fertile CM at all and I have low libido. I always feel tired and unmotivated. We've been ttc for #1 for almost 2 years with no luck. I am 26, DH is 27. Aside from PCOS, which is maintained, we've done all tests and results came back great. I also have a regular period that comes every month.

Any supplement for CM? And to increase my libido? I am going to take letrozole if I don't get a BFP this cycle.

Also, is it safe to take vitamin D even without taking a blood test to see if my levels are actually low?