Walk Behind Lawn Mowers

Hi Team,

I have a Husqvarna 775H - Briggs engine walk behind mower , while scrapping off the grass under the mower I had leaned the mower on it's left side(towards air filter) and oil leaked everywhere including air filter , I have replaced the air filter and put oil afresh. after this when I started I see a little oil spluttering out of muffler(exhaust) and white smoke coming, I have not run it for long.. Is this a concern ? what I should I be doing ?

Thanks for your help
Jay