Positive PPD

Has anyone ever got a positive on their PPD test before? I've had a PPD test numerous times and this is my first time getting a positive. Now I have to go in for a chest x ray. They keep telling me it doesn't mean that I have tuberculosis, but I'm still kinda freaking out. I'm not sure how I could have even been exposed since I'm kind of a home body. Being 19 weeks pregnant I'm a little worried what further tests might say. Has anyone else gone through this?