Hi thanks for your question.
Tumors of uterus
are called fibroids.These are benign tumors and grow very slowly.You can concieve with fibroid inside your uterus and can complete pregnancy safely but sometime it can become a cause for infertality.You can get your fibroid removed before planning pregnancy, if it interfers with conception or after completing pregnancy.However sometime it causes bleeding during pregnancy
leading to abortion
and may also become a reason for postpartum haemorrhage.So there is nothing to worry you can take descision accoerding to your convenience..
Hope this answers your question.