hi you have periods that confirms that pregnancy
was not there.your nausea
may be due to your smoking
habit.your constant headache
was also seems to be due to migrain .for your concieveness you should try follwing method.if your menses is about regular pattern & as for example for 30 days make a three equal division of 10 days & go for intercourse compulsory for middle 10 days.you can go for intercourse any time but for middle 10 days it is compulsory.wait for 3 contineous month.wish you a happy child.