Last period was Mar.15-21.. haven't had one since?

Hey ladies.. I'm kinda freaking out and I just wanna get a couple opinions.

I haven't had my period in 7 weeks, so I'm over 2 weeks late on my period.. (should have started week of Apr.15.. I'm almost never late minus a day or two.

Now, the last two months I haven't taken birth control but I've still been regularly having sex with my boyfriend.

A week ago, I went to planned parenthood and took a pregnancy test, which came out negative. Two days later I took and at home because I still wasn't confident I wasn't pregnant, still it was negative. Today, I took another at home test and again it came out negative..

Now, I'm getting a little nervous something is wrong with me..

Any ideas, opinions, or calming thoughts?