Gem, I didn't know what gender either of my 2 were either. With my 1st I came across the name Zain after the m/c and it just seemed to fit. With my 2nd I'd been really drawn to the name Izabella during the PG and so that was what I named my bub.

I don't think it really matters if you're not really sure of the gender. If you like the name Anabel then I'd say that's the right one for your bub