wedding!!

so I'm a bridesmaid in my cousins wedding that's in July.. but I also just found out I'm pregnant!! I'm 5 weeks and it says I'm due August 2nd or sometime close.( I don't remember) but we had to go order my bridesmaid dress tonight.. no turning back now. but I'll be about to pop by the wedding!!! I don't know what to do!! will I still fit into my dress? will I look fat and disgusting?? I haven't even told my family about my pregnancy yet!! 🙃 I need some opinions!