Congratulations on getting to half way, I hope the rest of your pg goes really well and before long your cuddling your precious bub.
One of the things that some of the BB people have been talking about is "the ring test", it is more for fun and probably shouldn't be taken too seriously, have you heard of it? The other thing is the Chinese gender predictor, I,m not sure how accurate it is with IVF , lot of people say it's good.
Best wishes