my little girl is 27 months and has shown signs for potty training. I started last week putting her in knickers she had many accidents the first day but these have become fewer as they days pass however i am now on day seven and although she has used her potty 6 times over the last week she is now saying i want a wee i want my potty she pulls her pants etc down sits on for a few seconds then says i finished and gets up obviously there is nothing in the potty she does this three or four times then has an accident what should i do?