Middle back stiffness/slight discomfort

Out of pure spontaneity I asked one of my friends to sit on my back while in the "up" position of a push-up. I told him to get off, but he didn't. A second afterward I felt a slight twinge in my back. He then got up. I didn't think anything of it then, 'cause it really didn't bother me. It doesn't bother me much now, either, but there's a noticeable stiffness to some of my movements, and sometimes even a slight discomfort (not so much painful). I do sets of pushups, situps and pullups every Mon., Wed., Fri, and I also jog Mon.-Fri. 4 miles on avg. I swim at least once a week and sometimes more if I'm in the mood for chlorine. Should I be worried? Should I just continue as I was? I don't think where I feel the slight discomfort (pain, if you really wanna call it that) would be affected by my exercises, but multiple opinions would be appreciated. I'm thinking when I do my swim for the week it'll feel a little better the following day. I'm not sure though. I'm on an 18 week program and I'm starting week 7. I don't want to mess this up now. I'm 19 years old and have been exercising for quite some time now (before I started this program).
 
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