If you've become a homebody recently, be reassured it's quite normal. Wanting to stay at home is common in the final stages of pregnancy. You may be reluctant to plan social engagements for the next few weeks, just in case. For example, you don't want to spend money on a theater ticket that might not get used. Do, however, pencil in dates with friends because they will understand if you cancel last minute. You'll also find that once you're on leave, you're glad to get out of the house in the evenings.
Take the opportunity to go out with your partner in these last few weeks since dinner dates may not be on the agenda once the baby arrives.