I Have Tested Positive On Preganews And Also Have Missed

i have tested positive on preganews and also have missed my period by over 10 days. I am having slight cramps and feeling cold, chilled at times. My breast also pains like hell. Is it normal? We have been trying to have a baby from past 3 months and i also had my cycles prolonged in between from 28 days normal to 32 days. Is it normal or should i be worried?