I Think I Have Wrecked The Lawnmower?

because inadevertently tipped it up on it’s end to check the blade and since then it will not start. I know the oil has seeped onto the spark plug so I have been cleaning it. The air filter appears to be okay, so the only thing I can think of is that the engine is full of oil. It’s a Briggs and Sratton??? petrol motor rotary mower. Has anyone any ideas please. No rude answers please!!