I have thought I was pregnant for a few weeks. Is this a sign ?

Hi I have thought I was pregnant for a few weeks. I missed my period I was suppose to start on June 9th and its now June 29th. I had sex multiple times in May. All protected (or so I thought) I have had bloating, constipation, Nausea, Food aversion etc. and today while I was cleaning My nipples got really hard and when my shirt would rub against them It would hurt soo bad, that has never happened before. Is that a sign of pregnancy as well? (I have only taken one test a few days after I missed my period and It was negative but my friend who just had a baby said I might have tested to early so im planning on taking another one.