Eee, scary lah! Honestly, I'd call your gynae straightaway je sebab area tu sensitive and blood blisters during pregnancy memang kena proper diagnosis, bisa jadi hormonal changes, trauma dari activities, atau something else yang doctor je boleh confirm. Don't try to pop it yourself ya, nanti infection atau complications lagi. One of my mum friends had something similar and doctor dia just advised to keep it clean, wear loose cotton underwear, and monitor it, hers resolved on its own but she needed the confirmation first. Better safe than sorry when it comes to private areas during pregnancy!