Well, I have a different way:
Dont use the love potion. You can just keep it as something pretty.
1) Hatch a female and male tamagotchi
***You can't mate a Japanese with an English version***
2) Raise them, as you would normally do.
***It is EXTREMELY important that you do not connect AT ALL untill they are both 5 years of age***
3) At 5, connect untill they are both 2 hearts and 2 smileys.
Make sure they always have the same feelings for each other.
4) Now is the final moment- one more connection and the male will go to the female's case....and so forth.
Hope you enjoy!