96 Astro problem

Hi guys
I hope to get some leads and advises to help me figure it out what's wrong with that van.
Ok here is a story , about a month ago on the way to work i noticed temperature going up,so i pulled over ,got out of a van and noticed a coolant underneath ,but not in large amount.Luckily ii was on gas station so i purchased a bottle of coolant ,added to system and drove home with no overheating .I took a dog house out from inside and noticed that coolant was leaking from underneath intake manifold,right by the driver side head. Went to a store bought new gasket and bagan pain taking procedure of changing it,few hours later it was done .Checked oil ,it was ok right color and amount made sure everything else is ok started van up .LOng story short it ran fine for a few minutes and then a white smoke start coming out from the exhaust shut it off check the oil and it was a milkshake color and way high.

So did i screwed up a gasket instalation. Is it possible that coolant is leaking to the oil and is getting sucked thrue intake valves causing van to smoke white ,or could it be a blown head gasket? (i did not overheat it while loosing coolant at the beginning)
I would be thankfull if somebody will help me to figure it out ,before i start tearing an engine apart.

yeah I'm afraid you diagnosed it right.
something went wrong with the gasket install.