Weddingbee boards

i am getting married in less then 5 months and i am looking for a strapless bra for a sweetheart shaped wedding dress, but can not seem to find a company which helps us smaller breasted women and make the style and shape i need. I am wondering if anyone has had bra cups put in the dress or if that is not able to be done. i what not to feel like i keep having to pull my bra up all night. i would also like a little more cleavage for my special day not to look flat. If anyone could we help me !!!!!!!!!!!!!!!!!!!!! thanks bride to be