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Yes fibroid tend to grow in size with duration of pregnancy
. Most pregnant women who have fibroids will not experience any complications with their pregnancy either. However, fibroids during pregnancy do increase risk of miscarriage
or preterm labor
slightly. Occasionally, complications can arise if fibroids become very large. Complications can include: postpartum hemorrhage
, obstructed labor (if the fibroid grows into the birth canal), fetal malpresentations (sometimes fibroids grow into the uterus, forcing baby into an unusual position), Delayed progress of labor. Increased risk of cesarean section.
As in your sister in law's case fibroid is big and in lower part may cause problem later in pregnancy and labor. Need frequent check ups and monitoring. If conditions are not favorable at the time of labor she may go for caesarean section
. Take care.