Late!!

Tawni
I'm not too sure if I'm actually late or of this is because of the depo. 
I started the depo January of this year and stopped for many reasons after my third shot. I got my first period a month after I was supposed to get my first shot and it lasted about a week with what I'm assuming is a normal flow. I've always had a heavy one. But I was supposed to get it again this past Monday and nothing. No symptoms nada. 
I've had sex since I got off the shot. My bf is in the army and he had training when I decided to stop. When he got back we had unprotected sex for about a week then we started using condoms again. That's when I got my period and we've been using condoms since. 
I've only had one pregnancy scare and that's when i decided to get on BC and that was last December. 
Idk if I should buy a test or not because I have always been for the most part irregular and then with the shot I know it can mess my cycle up. Should I give it a little more time?