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I can't give you much in the way of answers, but I would suggest getting a second opinion. Do you see a rhematologist? If not, you should.
Autoimmune disorders can wax and wane. And ANA levels are not a good indicator of weather it's progressing or receeding.
Since it has been 10 years since the dx, have they run a repeat of the different tests other than ANA? There are others used to help point them in the direction of which AI, such as lupus, scelroderma, etc.
As to preganency with AI... I have a positive ANA, undiagnosed AI. My "baby" is now 16. I have had 4 pregnancies, three live births. My first was normal pregnancy, lost the second (may have been helped by my very physical job), 3rd born 8th month and on apnea monitors for 4 months, 4th, almost lost 4th month but bedrest kept him "viable" and he was induced in 8th month. I'm also ashamed to admit, I smoked during my pregnancies which most likely helped the problems.
Today they are 22, 18 and 16 and healthy. One even gave me a grand-daughter.
prolonged medication may or may not be necessary.you must undergo fresh range of tests by a specialist .autoimmune diseases may sound incurable but at your young age as you grow some genetical memory mutations occur over a period of time when right body environment for last 10 years of treatment may have initiated a 'new type of body response" you never know ,so there may be lot many chances that you may not require further medications, if not , then dosing may be tapered and you shall not progress to any further diseases you fear. See a rheumatologist and vascular specialist in a good hospital.transmission of autoimmune disorders is difficult to predict kindly consult a genetic expert and a gynecologist
prenancy risks are great if you have SLE for which you are on plaquenil also a great risk for fetus and mother.get accurate diagnosis done before taking any risks