If you really think you might be pregnant but are not showing up on tests, than you should go to the doctor. Especially if you are getting strong symptoms. Even if you are not pregnant, the doctor can help you figure out what is going on.View Thread
One thing to keep in mind (my doctor told me this when we started trying) is that 70% of healthy couples get pregnant within a year... so she basically told me to expect 12 periods before a positive.
That's not to say you won't get pregnant before that (it took us 7 cycles) but also don't think something is wrong with you if it take a little while.
And if you find yourself getting stressed out about it, take a break - meaning take a month off of thinking about it. I was getting stressed and anxious about it - so I took a month off and just did whatever I wanted with my husband and relaxed - that's the month I got pregnant View Thread