Barbie yes that should be of concern. I'm not an MD but I think a CTA or MRA would be appropriate bcuz aneurysm or AVM (arterial-venus malformation) has to be ruled out.
Do you have a family hx (history) of aneurysm or AVM?
Are you being seen by a good neurologist? If so you might get a good 2nd opinion. Search for a good neurologist (not general practitioner or family medicine) in your area and pursue him/her hard.
Be willing to travel.
Keep us posted and seriously consider avoiding pregnancy until all imaging is done to include interventional radiology (mapping the brain vasculature with dye). In case you have a vascular defect.
Keep us posted ok?
God bless