Couvade is usually felt by men later on in the pregnancy, if it is felt at all.
I would take another test, the hormone level might not have been high enough a few weeks ago but if you only had a light period at the beginning of this month it has been enough time to repeat the test.
Sometimes, especially when you are young periods can be irregular until you settle down into a regular cycle so it could be just that..
Your boyfriend sounds like he has a gastric flu/virus
Good luck