broker and lender tied together

[Chase London]

I recently signed an agreement with a broker to represent me in the purchase of my 1st 4unit property. (Havent found it just yet ) She introduced me to a lender who coyld possibly get me financing (fha loan route w/3.5 down payment) Lender is waiting for me to send over 2013 2014 tax returns and upcoming tax returns along with all w2s. Im wanna know if you think it was a bad idea to use a lender brought to me by broker who im thinking works together? Also I want something under 90k , is it possible lender could say 90k is toolow and require a higher amount for loan?