Hello AJPTRF I believe you misinterpret what we've said here before. Disease of the head, heart and blood vessels can cause symptoms that resemble ophthalmic migraine but they do not cause ophthalmic migraine. Think of it like this, you can get chest pain from a heart attack or you can get chest pain from doing 500 push-ups.
The more serious diseases cause transient ischemic attacks (TIAs) which resemble migraine. TIAs generally occur in older, sicker adults with multiple risk factors: smoking, high blood pressure, heart disease, diabetes, history of stroke or heart attacks, etc.
Ophthalmic migraine often occur or increase in women when hormonal changes occure: ie when they start to menstrait, go through menopause, get pregnant (you) or go on birth control pills or estogrin pills, shots.
It is by far the most likely thing that you have ocular migraine caused by hormonal changes associated with your pregnancy.
Only if these persisted or worsened after the baby came would you need a extensive work-up.
I would say relax and not to worry. Good luck with the pregnancy and delivery.
JCH III MD Eye Physician and Surgeon