possible to be pregnant?

Is it possible that i could he pregnant.. i have the pill and the rod its a long story the doctor wanted to do some tests but anyway my period has been steady and the same for about 5 months then all of a sudden its going weird and getting period period half way through the months and at the end and been feeling really sick at morning amd night and my back and chest have just been aching and cramping up really easily. Plus i still get my period but his mum got her period till she was 6 months of being pregnant with him and its all really weird. Is it even possible? Or