Confusing

ok. TTC month 5. 2 sundays ago, 4 days late ...negative test. fast forward to the following thursday....negative test. its now monday. no period. boobs are tender and swollen. tired all the time. just have a feeling I am. and i get slightly nauseated if i dont eat every couple of hours. no cramps. no pressure. no sign of impending period. lol. what to do? Should I take a test again? only way I could be and the test be negative at 8 days late is if i ovulated super late. first day of my lmp was feb 4th. would make me 6 weeks today. no way would I still be testing negative. right?