Pregnant?

So, this is my best friend's pregnancy test but i just want to clarify it. She peed on the stick for 3 secs she said. Only one line showed up. She went back to check it again after 5 mins and now the second line showed.

The thing is, we drank alcohol before this. Would it be bc of the alcohol? My best friend missed her period and she was supposed to have it now. But the thing is, she has irregular periods too. So its confusing sometimes. Its hard for her to get pregnant. What do you guys think?