Hi,
Thanks for the query.
According to your description, the mass you mentioned could be a fibroid.
And yes, fibroid can affect the chances of
fertility.
As it is centrally placed, it can lead to defective
implantation.
Because of larger size, sometimes it can occulde the passage of
spermatozoa, ovum, zygote etc.
If you conceives also, fibroid can cause problem in
pregnancy.
Fibroid will grow during pregnancy.
That can lead to complications like red degeneration, premature uterine contractions,
miscarriage etc.
For more details: http://srsree.blogspot.in/2013/11/fibroids-part-1.html
So, better to get treated for fibroid first. Then you can plan for pregnancy.
As you want to conceive in future, you can go for conservative management with your doctor's advice.
Take care.