Checkers laid only one egg! cause for concern?

[poco]

Mommy and Checkers, the pij couple from our Montreal balcony have produced their second clutch this year: only one egg, laid on April 17.

Incidentally, after we saw this egg was laid by Checkers, we finally realized Mommy has been the father for the last year! lol His 'name' remains Mommy.

Question: I remember previous posts saying the mother might be obstructed if only one egg was laid...she is eating, flying like usual. Should be we concerned? Is there anything we should do?

Thanks all,
Poco

Here is Mommy and Baby fledgling, about 40 days old, contemplating flight. (still hasn't jumped the balcony yet).