I started reading to my baby ever night when she was 6 months in the womb. The same story every night, so that she might recognise the sound patterns. Now at 12 months old she loves when I get out a book to read to her. Her favourites are Harold and the Purple Crayon or The Gruffalo.
I started to read to my son when he was about 4-5 months in the womb, just like you. I read him a collection of nursery rhymes that he turned into his favourite book until the age of two, when he discovered Little Critter.
Nice. It was a great way for me to bond with my unborn baby.