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A 32-year-old gravida 2, para 1 patient presents to her obstetrician with a small amount of vaginal bleeding. Her last menstrual period was 8 weeks ago and she had a positive home pregnancy test when she originally missed her period. On exam, her cervix is closed. Transvaginal ultrasound shows an intrauterine pregnancy with a fetal heartbeat of 140 beats per minute. Which of the following is the most likely diagnosis?