yes your molly is defanatly pregnat. i now this becouse my sister has an aqourium full of them and that is exactly what happens when the r pregnat. But if i were u i would get a birthing tank as soon as posibal and put the pregnat molly in it.and as soon as it has given birth take the mother molly out coz it will eat the babies if it had a chance to.
P.S mollys give birth to live young in about three to four maby even 5 weeks after getting pregnant
