Help guys i know that i should'nt be bugging out but i can't stop.can ne1 help?

I am researching everything possible on pregnancy and i buggin' out about down sydrme and fas. I spoke to sme friends here and they said don't worry about the fas. Alot of weman do things b4 they find out there prggo. I have'nt had a drnk since but im guilty of smking. I don't smoke my sme brand i switch to ultra lghts and it tkes me 7-8 days to finsh tht pck and if sme1 needs 1 i gve 2. I know i need to stop but for sme resn i think this is not gong to be a good prgncy.(mng i may lose it) i havnt had an u/a yet i will on 2-5-08 . I found out i have a cyst 1-2 weeks b4 cncption.I cant stop thinkng tht i may loose this child. one day oim freaking happy and want to go shopping now but the next i just dont believe it. I dnt tell my fiance this (he dsnt knw i smke either) i dnt want him thinkng i dont care but i do. for sme reason im thinkng is when i see the u/s it will smack the **** out of me and reality will hit! please help a sista out.