First month TTC

I started my period yesterday and I actually pretty bummed and so is my boyfriend. My sister is TTC as well and she's been trying longer than I have and she has been getting stressed out and upset since it's not happening. I don't want to end up like that. What can I do to make this happy moment stress free and what can I do to make my chances of getting pregnant higher? I feel like I'm not doing something right. I bought ovulation tests but I haven't been able to use it yet because I'm on my period.