I absolutely love the headcanon/trope that Peter finds out about Pepper's pregnancy before she does, because he can hear heartbeats. It's canon now, I've decided. Pepper becomes pregnant with Morgan before the events of Infinity War and Peter's the one who tells her.
He even does a reveal with those mugs that say "You're going to be a daddy!" with one for Tony and one for Pepper that says "You're going to be a mommy!".
But something I love even more is that my other obsession, BBC Sherlock has something similar. AND IT'S ACTUALLY CANON.
Sherlock finds out that Mary's pregnant before she does, through deductions. He notices her appetite's changed, her taste perception's changed and she's been experiencing nausea that could be put down to pre-marital nerves. But he puts it all together and deduces that she's pregnant.
One of my favorite headcanons for MCU Spider-Man actually happened on Sherlock! I love it when this stuff happens.
