mother necklaces

so i kind of want a mother's necklace, but i can't find any that i like. the ones that are nice have birthstones in them, so i can't really get those now because who knows what month the baby will be born in (esp. because i'm due at the beginning of the month).

i'm looking for something simple like this:



or this:



but both of those require a birthstone or knowing boy/girl (and the latter's a big cheapy looking - i want something to last) and i honestly want something now to wear for the pregnancy.

any suggestions?