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well my last period was 1/1-1/3....i dont know when i o'd either last thurs or friday or this coming week. well we had sex on 1/8,1/9,1/10,1/11,1/12, & 1/15.....how much more do you think i should have sex to catch the egg. i dont temp but i chart...i did use opk's but all neg's. my darkest line was on 1/11 and i had no lines till today again....it was darker the faint.....when shouod i test and should i keep having sex