I just want to rip off my bra and clothes...

Sitting at work 19weeks today my pants dont button so there tucked into my pants, my bra is to small all of a sudden my shirts feel so damn tight ughhhhh!!!! Why? I feel like a fat whale and cant even see my own vag when im sotting lol. Im so annoyed but live my widdle baby! I just dont want yo keep spending money on clothes that im going to have to keep buying new ones anyway.