The sacrifices this man makes for us

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seen from Lebanon
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The sacrifices this man makes for us
Nipple Chafing
TMI
I'm assuming that this will be a bit of TMI for everyone, therefore nobody.
However, I went to the gym today, and I decided that I've been feeling better so I would go back to doing the treadmill for my cardio. However, after about 20 minutes, my chest just started burning! Like, REALLY burning. This happened last Monday when I went (which was the last time I used the treadmill before today) and I thought that it was just congestion in my lungs or something, so I cut it short.
Today, though, I realized that it wasn't burning inside, it was burning... outside. I experienced nipple chafing. I'm going to try to prevent this next time by trying a different one of my sports bras and maybe applying a bit of Vaseline.
Really, though, OUCH. It just burns really bad.
Although, I've been googling it in attempts to find remedies/specific causes, and I swear, all of these sites saying I might be pregnant are freaking me out! It's not uncommon for this problem to happen while running, though. I'm hoping it's just from the running, because really, they only burn like that or hurt AT ALL when I'm partway through my run on the treadmill.
Guess I'll find out for sure eventually, right? Haha.
This shirt always chafes my nipples.
Tmi?