I'm with Catherine, I'd definitely give them a call. And, with your past history, you'd definitely be considered high-risk, can you ask your midwife/OB for a referral to a high-risk OB?
Don't worry about making a nuisance of your self - you are a concerned mommy and with good reason. These people get paid very good money to take care of you during your pregnancy, that's their job - don't worry about asking them to do it! (Easier said than done I know, I hate to "bother" my doctor but, preeclampsia has helped me get over that [xx(])
Please keep us updated.
Zachary James, 7/22/03-7/27/03, born at 26wks - severe pe
Southern California Coordinator