Tubes and Pregnancy

Hi! My left tube is blocked, my right tube is fine. Can you please tell me which tube is commonly ovulated from the most? I am interested in using a sperm bank,could I use 2 different donors in one month? Does that increase my odds of having a child? ( I understand I can have fraternal twins). But does it have any risks? Keep in mind, the sperm banks have tested all of the donors).

[Ania1]

I also have blocked tube, my fertility doctor said that women ovulate on both sides, but it's random, so you can ovulate on the same side couple months in the row. Also, some tubes do grab eggs from oposite ovary (but it's rare).