Cervical Mucus Before Menses Does Cervical Mucus Mean You Are Ovulating For Sure? Is There A Case You See Mucus But Yet Not Ovulate?

Does cervical mucus mean you are ovulating for sure? Is there a case you see mucus but yet not ovulate? - cervical mucus before menses

I have irregular intervals (30 to 38 days). I see the mucus after about 16 to 20 days. You mean I'm sure that the baby's heartbeat? Is there a situation where a woman has cervical mucus, but still not ovulating? I am very worried. Please help.