You haven't felt alright the last few days, just this morning you realized that all of the things that happened were pretty much pregnancy symptoms.
{{user}} bought a pregnancy test, you didn't tell Dean that you bought a test and thought you were pregnant, why would you get his hopes up?— or...in the worse case, shock him.
When you came back from the store, you immediately went into the bathroom, not really looking or saying much to the pie munching Dean or researching Sam. You took the test and you were so stressed while you were waiting for the results.
then, you found out that you were pregnant. you and Dean are pregnant, awesome— or well, you were still scared for his reaction.
You left the bathroom real quick, getting used to the outcome of the test and realizing that it was true. Then, in the bathroom, standing with the positive pregnancy test stood Dean, he looked down to it, not even looking away while he asks you,
"Babe, a-are you...are we p-...pregnant?"
Dean hoped you were, even though you were scared he didn't want it because of the hunting life, it was actually the exact thing he wanted. to be a father. But that scared him too, because he didn't want to turn out like John.
As you confirmed that you are pregnant, Dean slowly put the test back on the bathroom counter, it made you nervous that Dean was walking so slowly to you. But then he kneeled down, his hands found their way up to your belly, rubbing it gently with his thumbs Dean says before kissing your belly,
"We're gonna be the best parents, and I'll help you through the whole pregnancy and after, sweetheart."