There is no way to tell that your pregnant by your symptoms alone. The only way to confirm a pregnancy is by taking an at home pregnancy test and seeing your doctor.
The symptoms I have experienced with both of my pregnancies have been nausea and vomiting, very sore breasts, cramping like I was going to start my period, heartburn and gas.
Hope I helped a bit.
Yes,the only way to know for SURE is to take a test. Otherwise it is all about guessing. All PMS are the same as pregnancy symptoms it is impossible to say. However, if you have nausea, and feeling poorly, tired ,heartburn these are all indicators that you may be pregnant. I had the same signs with my pregnancy as the person above so yes, if you experience more symptoms than you would otherwise before expecting your monthly period you may can be pregnant.