nauseas and headache

Seoul
I am trying to conceive, according to glow, 16th was supposed to be ovulating day, i had intercourse on 13 and after that on morning on 16th. On 14th i was ok, but on 15th i fet nauseas, bodyache, funny taste, i dint eat much, 16th follows the same, i am still having severe headache, i dont understand what is happening? I have never experienced this during ovulation, i am not able to do my job😭😭😣😣