should I test?

So Took plan B before I started my last AF, and my period lasted for 8 days after that. From April 9th-16th, I was suppose to start my period today but I didn't, I took a test three days ago and it was negative but I've been having really weird food cravings, putting on some weight, not sleeping so good, in the mood all the time, and my nipples are always hard! (That is extremely rare for me) should I test again?