hi there, i just had a diagnosis of fibroids (three, roughly 4cm each, give or take) when investigating my last two m/c. from what i was told, smallish myometrial fibroids (buried in the muscle layer) should not affect you giving birth, even near the cervix (one of mine is) but regular u/s to check the growth is recommended as estrogen in pregnancy can make them grow rapidly. your fibroid is very slow, from those measurments. depending on your age, i would adopt a wait and see approach, after all, if a c/sect becomes necessary you can decide pretty much at the last minute. i've been told by the midwives, the OB and the consulting radiologist that 4cm should not be a problem.

good luck