Hi i have been frequenting these threads for a while getting advice for my 3 y/o aswell.. here are the links maybe you may find some tips on there

https://www.bellybelly.com.au/forums...-2-toilet.html

https://www.bellybelly.com.au/forums...ddlers-2s.html

good luck hun, i sympathise with you i have little less then 3 weeks left til the second bubs arrives... thought he'd be trained by now...