Does thinking about TTC all the time affect it?

My first pregnancy was a surprise so didn't have time to think about it but have now started trying to conceive number 2 and during ovulation I just felt so nervous wandering if it was going to work and the dreaded wait to AF is taking forever and although I try to not think about it I can't help it!! Do you think this has an impact on TTC conceive successfully? Or have you gotten pregnant when feeling this way? Thanks!