you may not feel stressed but you period may be late due to aprehension of hoping you are and also from the stress of trying. That happened to us when we were 1st trying. And we even did relaxation exercises to "help the cause" but our drs. told us that our subconscious can still carry the stress even though we don't feel it. The thing that finally helped us was to just stop trying. And as soon as we did and focused on each individual day and living the most, it happened. "stopping" doesn't mean to give up enjoying yourself, but it can also help the male, they can produce more swimmers. When we did, my cycles went back to being clock-work on the 3rd of the month, They'd slipped to varying up to 8 days.
So if you've had your regular check ups and the dr doesn't haven't any concerns then just have fun.