My son gave me lupus disease ?🥺☹️😣😢

So basically i had my son 3 months ago. Hes my only baby. Im 26 years old. Lupus runs in the family because my mom and 2 tias have it.. it all started at 8 months pregnant i was having horrible wrist pain outta nowhere. So i started having tests done a month ago and it turns out my baby ate up and took away all my vitamins and nutrients and stuff when ur pregnant and that u can develop something.... so my #’s are alittle high for a autoimmune disease.. doctors say it can be lupus or arthritis or something else that dont get scared.. but im already scared.. ☹️😣 lately my upper body has been achey alittle. Im not thinking bad or anything..Im making my appointment asap so they can run more tests to see what it is... but why ?!? Anyone ever developed something after birth? Like a autoimmune disease or something??? Can i still have more babies if i do have a disease )?😓😢🥺 because i do want 1 more baby😢😭😭😭