Thanks for your query.
Congratulations on your pregnancy
From the information you have given,
the possibilities are
1. Cervical polyp- tongue shaped projection
2. Cystocele- protrusion of the urinary bladder
3. Vaginal cyst-usually globular
4. Uterine prolapse- protrusion of the uterus
5. very rarely a tumor
The chances thats its a serious cause is less.
You need a thorough examination by your doctor which will include a speculum examination to look at the vagina & cervix
Your doctor may also take biopsies if she suspects anything more.
Your doctor may also ask for a scan to get more information about the lump.
In either case, it should not hinder natural delivery if other factors are favourable.
Please meet your doctor asap to get a definitive answer.