David Hancock, 22, of Ordsall Road, Worksop, admitted the theft.
He had been walking back from a party when he climbed up Danielle Bonser’s bay window.
Heavily pregnant Miss Bonser saw him at it, and told police: “I felt very scared, especially in my condition.”
Defending, David Grant said his client was very drunk and the sheeting needed replacing anyway.
Hancock was fined £100, £85 costs and £15 victim surcharge.