32 week apt...

So I just got home from my 32 week check up and the 1st thing done was checking my BP. It was 140/90 which is abnormally high for me. Then my dr came in and started asking me if I've been experiencing and cramping and such and I told her yes, mostly at night and it feels like period cramps. She then told me that the next time o experience it to call her and she wants me to go to L&D to have a sonogram and such done. Then she had the medical assistant come in to take my BP again and it was 120/86. Should I be worried? I just thought it was weird that she would want me to call over some period cramping and want me at L&D so soon for something like that. Do you think she's afraid I'm developing preeclampsia?