Hello, Thanks for trusting us with your health concern. I have gone through the query and would like to offer you some information. Zosert is a category C drug, which means that animal studies have shown fetal adverse effects and there are no adequate human studies. So, please check with your health care provider if you can switch to another safer medication. If the suspected fibroid is superficial, it may be left alone and monitored closely. However, if it is nearer to the endometrium, it may hamper the growth of the pregnancy and further active management becomes necessary. Please see a specialist for a proper appraisal. Wish you safe motherhood.