I have an attraction to the same sex. Can this feeling I feel take any effect on my unborn baby girl. Or am I over thinking it.?

No. It is not known if sexual orientation is genetic, metabolic, or what, but your thoughts will not directly affect your unborn child. If you have not previously had a homosexual or bisexual orientation, a change in thoughts about sex could even be hormonal. Many women have changes in their thought process during pregnancy.
Sexual Orientation. A person's sexual orientation dictates their attraction to same or opposite sex individuals. Current thinking is that sexual orientation is establish by the time a person is born. We do not know what factors influence or determine a person's sexual orientation. There is no evidence to support that one's orientation could be influenced by a mother's orientation. Further research is needed.