Sweet tooth out of control, help!

I don't normally like sweets and I've been craving vegetables my entire pregnancy. (I normally love veggies but this is a whole new level). However at 25 weeks I'm suddenly gripped by the NEED for CAKE!! Help! I've gained 25 lbs up to this point and was/am a normal weight. Please tell me to just eat the cake. Please. Chocolate. Anything.