Could I be pregnant

Hello everyone. I am 23, And have been with the same guy for 4 years now. Last week I think we concived. We had an accident( well I really want to become pregnant) and I have no clue. An at home test said no but I think I am not far enough along to tell yet. I started my ovulation the day after, I am now not felling that great one week after. I fell as though ny breast have swollen 10 times thier sizes, and my stomach is not felling that grand, I have diariah. I want to sleep all day if I could. I just feel weird not like I nomally do after I have had my period. Thank you very much