9days late 3 negative test... wth?!

Ok so two months ago I had a miscarriage, and the following month my period came as it normally would. This month I have missed my period by nine days, I have taken three pregnancy test and all have came out negative. (Took at 2,4,& 6 days late)  I do however have some symptoms breast are sore but nipples are out of control sensitive, painful and pinkish/red (sorry TMI I know) I had almost no cramps, some nausea and food diversions. Any chance I could be pregnant again and it's just not showing up yet.