When was Bellatrix Lestrange pregnant with Voldemort's child? Nope, she's the child of Voldemort and Bellatrix Lestrange, who was born at Malfoy Manor just before the Battle of Hogwarts.
Before her death, Bellatrix secretly gave birth to an illegitimate daughter named Delphini, whom she conceived with her beloved master, Lord Voldemort. Delphini was conceived sometime after the Battle of the Department of Mysteries in 1996 and before Bellatrix's death at the Battle of Hogwarts in 1998.
The biggest revelation in Harry Potter and the Cursed Child was that Lord Voldemort had a daughter with Bellatrix Lestrange, who was named Delphini.
The print line on the copyright page must read “10 9 8 7 6 5 4 3 2 1”, ten down to one, exactly. The lowest figure in the print line indicates the printing. (For instance, if your copy has “20 19 18 17”, it's a less valuable seventeenth printing.)
Modern pennies are mostly zinc, which means that jug would weigh about 114 kg. Each penny is 2.5 g, which means each kilo is worth 4 dollars, so the jug full would be around $450.