For the past few weeks, every time I've drunk fresh orange juice it tastes really strange. The best I can describe it is that it tastes almost like I imagine rotten eggs would, kind of sulphuric.
I thought it was something to do with my fridge as the taste gets worse the longer the carton is open, but I've also noticed this weird taste (although not nearly so bad) in juice I've had in cafes and this morning I had a small bottle of Tropicana straight from the shop and there was a definite tang. 
Any ideas? Zero chance I'm pregnant. It's just baffling me and I want to know if there's anything I can do before I give up fresh orange juice for good!