Yes I do believe it... to a certain extent. After my last miscarriage I saw a Shamanic healer and she 'spoke' to my spiritual guide and then came back and told me that I was so obsessed with falling pregnant that I kept manifesting these pregnancies (I fall pregnant quite easily) but the timing was all wrong and baby just wasnt ready so I would miscarry.
So yeah I believe you can create events with your thoughts but for them to work out how you want them too its all in the 'universes' timing... not your own.
Theres no harm in putting your desires out there and if its meant to be, it will be.