How much longer?

My, newly, husband and I have been together since we were 15 in high school. Now, 10 years later, we are finally married and currently on our honeymoon. We have been sexually active for 9 of those 10 years, 8 of which have not been 'protected' in any way. My periods have always been very inconsistent but I never felt like there was a problem. Now that we are married and I have graduated college (something I told him I wanted to accomplish before we got married), starting a family is at the top of my list. And like I said, we have been sexually active since we were 16, and officially TTC for a number of years now, but every time I am late, I get my hopes up. I always get a negative. How much harder do I have to try? How much longer do I need to wait? All our friends have kids and they always ask when we will have one, and it's heartbreaking to say that we don't know. We are enjoying our honeymoon, the way newlyweds should, but every time we have sex, in the back of my head, I am hoping and wishing that his swimmers will make it and we will finally become parents. Seriously though, how much longer?