No symptoms till 10days post IUI but....?

then i started having mildly sore bbs, feel hungrier, mild cramps in stomach and have become more moody than normal... tested on Wednesday i.e. day 15 post IUI (which is day 25 of my highly irregular cycle) and got a negative... do i still have a chance of being pregnant?? already had 2 failed IUIs in dec and jan 2012.. so so depressed... doctor asked to test by the 7th of May... did i test too early... coz my bbs r still mildly sore and i feel hungry most of the times...