my husband and I have been trying to have a baby for a couple of months now...we havn't been trying hard core but we do have sex within the time span that I should be ovulating...this month I havnt had my period yet, but ive taken two test that have both came up negative..im only 4 days late. im start to think it was stress from school and work...now my question is when I finally start my period how do I calculate when i will ovulate? will it just start from my first day of my period? also if you have any pointers that might help me concieve that would be wonderful! thank you=)