So confused! Please help?

Me and my boyfriend have unprotected sex very frequently. He always pulls out except for twice in the past week or so but at that time I don't think I was ovulating. Its hard to tell when I am exactly because I have a very irregular period. The past week i've been very tired, i've been very nauseous all the time, every time I eat I get nauseous and if i'm hungry but i'm feeling nauseous I still eat, I crave food all the time, my back aches and my breasts hurt they feel very tender and heavy and i've never had pain in my breasts before. I have the odd headache, been sweating a lot more than normal, can't sleep at night time, and i've been very emotional lately. Also I've had a stomach ache all day and a little bloating. I haven't missed my period yet although I don't know when i'm expecting it exactly should be the beginning of next month some time i'm not 100% sure. Do you think i'm pregnant? Is it too soon to take a pregnancy test?