Thanks for your qurey.
You could definitely be pregnant witht he symptoms you describe.
Take a pregnancy
test if you skip your period.
You have not mentioned any details, as to why you cannot get pregnant.
In the absence of any pathology, you definitely can.
Please write back with more details about your problem in conceiving.
The symptoms could be due to an ectopic pregnancy, or could be pre menstrual symptoms also, as they are non specific.