We have been trying to conceive for over two years, and now im 2 days late. Normally my breast start hurting after ovulation and don't start until my period ends. But here only my nipples are hurting, my head is splitting, and everytime I brush my teeth, I throw up. I took a test the day before my period should have hit and it was negative and I'm scared to test again. How long should I wait to retest?