7 week old won't let me put him down

Sooy8

Long time reader, first time poster. My son just turned 7 weeks and up until now will sleep no where but on my chest. I have read so much about the rock n play, and many of you women praise it. But my question is how much different is it then a swing? I have a swing but at the most he will only last about an hour in it. Should I invest in the RnP. At this point I'm getting desperate and will try just about anything so that we both can have a good nights sleep.