Since day after ovulation (has been 13 days since my ovulation date) ive been nauseous and i am spotting brown and light red. ive been tired a lot recently to. what could this be?

You did not mention about your sex life but I doubt those symptoms are early symptoms of pregnancy and likely it is not implantation bleeding if you estimate accurately ovulation time. If I am correct, you probably begin your period and nausea and tiredness are coincidental. If I am wrong and you will miss your expected period in the next 7 days then you can do the pregnancy test.