First-time Homebuyer Tax Credit

My friend and I are looking to buy our first investment property but neither of us own a home of our own yet. We have a plan to purchase a home and rent it out. I spoke with a realtor yesterday and she told me that if I was to buy a house now, to rent out, that I may have complications getting a home of my own later on down the road due to me using my one first-time homebuyer tax credit. Say I get married in the future and my spouse and I want to buy our first home. Would this affect my spouses first-time homebuyer tax credit since I used mine previously on an investment property? I am curious if there are any ways around that or any tips on this subject. Thank you very much in advance.