A slight belly bulge in the first month of pregnancy could be twins, but it could also be caused by other reasons.
The first month of pregnancy even if it is twins will not lead to a small belly bulge, because one month of pregnancy belongs to the embryonic stage, the uterus growth is not yet significantly enlarged, the abdomen will not appear bulging phenomenon.
Just pregnant a month stomach slightly bulging is likely to be due to the hormone level changes in pregnancy body led to slow gastrointestinal peristalsis, the evacuation of prolonged abdominal bloating phenomenon; may also be the pregnant woman itself is fat, abdominal meat more, coupled with too much supplemental nutrients after pregnancy, resulting in obesity, so look at the abdomen will be slightly bulging.
In addition, gynecological oncological diseases can also cause belly bulging phenomenon. After pregnancy to do a good job of pregnancy checkups, you can go to the hospital to do ultrasound to determine whether the twins, as well as to determine whether the embryonic development is normal.