Brittney Griner -- I Knew About Pregnancy ... 'Surprised' By Announcement

Brittney Griner says she was blindsided by Glory Johnson's pregnancy announcement -- but it wasn't the fact she was preggo that shocked her, it was the timing.

Griner sat down with ESPN's Kate Fagan and said she was surprised that Johnson went public with the news when she did because "it's very early. It's too early to post or say anything about it."

As TMZ Sports previously reported, sources connected to the couple tell us Johnson has only been pregnant for less than a month.

It's still unclear whether or not Griner wants to have a relationship with the child -- or if she plans on helping out Johnson with the financial situation.

During the interview, Griner re-stated that getting married to Johnson was a "huge mistake" and said she only agreed because she felt pressured into it.