Help! False negative?

So I wanted to go out drinking with my hubby for a date night. This is our first month ttc after a m/c last December. I was a day late so I took a hpt, and only saw 1 horizontal line. Clear blue. Had a few beers (not a heavy drinker normally just celebrating). Looked at the test again today and it clearly turned to positive. Going to test again in the morning. My breasts are super sore and I'm still late. I'm super worried that the alcohol might affect the baby if I am pregnant. Can a blue vertical pregnancy line just appear after the test sits for a day?