XXXX in very early pregnancy.

@entity1 @entity3556 @entity548
INTRODUCTION: Little is known about the occurrence and patterns of @entity3556 during the earliest stages of pregnancy. We explore this in a prospective study of early pregnancy. METHODS: A total of 221 healthy @entity1 kept daily diaries and provided daily urine samples while trying to become pregnant. Of these, 151 @entity1 became clinically pregnant [i.e. pregnancy that lasted >/=6 weeks beyond last menstrual period (LMP)] during the study. Diaries provided information on days with @entity3556 and sexual intercourse. Urine hormone assays were used to identify ovulation and implantation. @entity1 were interviewed about their medical histories and lifestyle factors. RESULTS: A total of 14 @entity1 (9%) recorded at least 1 day of @entity3556 during the first 8 weeks of pregnancy. Twelve of these 14 pregnancies continued to a live birth. Bleeding tended to occur around the time when @entity1 would expect their periods, although rarely on the day of implantation. Bleeding was not associated with intercourse. CONCLUSIONS: Early @entity548 in clinical pregnancies is generally light, and not likely to be mistaken for LMP. Thus, early @entity548 is unlikely to contribute to errors in LMP-based gestational age. We found no support for the hypothesis that implantation can produce @entity3556 . Similarly, intercourse did not cause @entity548 . Nearly all @entity1 with @entity548 went on to have successful pregnancies.
