Hello there,
Jaw stiffness is a side affect of Loestrin FE. If this stiffness is bothering you I would visit your GP. All the best Trish
Unless you have a family history, it is not terribly likely that this is a stroke, although BCPs do raise your risk. More likely you are having trouble with a wisdom tooth if you still have any, or a stiff neck from late nights of studying or sleeping in odd positions. Or it might be your sinuses or another dental problem.
I personally do not like BCPs for birth control because of the hormones. See if your doctor thinks a plain copper IUD is good for you. The only problem I had was heavy periods for six months or so. If that's already an issue, then it wouldn't be the easiest choice for you. But I only had to pay a copay for this. Much cheaper and safer for me.
I would go just in case so you are not taking any risks it better to be safe then sorry