Could I be pregnant?

I guys im very new to all this. I today am 10 days late for my period. I did a pregnancy test last Monday and was neg. went to the doctors as was getting pain in my lower R side abdomen. they did another test and was negative too. they put it down to a UTI and put me on antibiotics. I thought they would of done a scan? I've still not come on and am getting so frustrated as were trying to concieve. I havnt had any pregnancy symptoms as yet. I'm following the app 'my days' to keep track of my periods etc...

Any suggestions as to what i should do?

Any feed back is much appreciated :) Lacey