none of my dresses fit....

We have an event to go to sunday wear dh will be in a tux and i need to be in a nice dress. I tried on ALL my dresses including the one i wore when iw as 9 weeks preggo last time and thats even tight. Granted ia m 12 weeks now not 9 but still

I am going to wear the dress i wore to Allison christening back in January but it certainly doenst look the same... why cant i just POP already