:hugs: Can't offer any advice, but just try and take it easy - like you said, you've read that there can be many reasons for it and that it can be ok - the more you worry yourself the more harm you'll probably cause! Can you get to the doctors for a check up tonight? If you can, maybe that's best, it'll put your mind at ease if you're ok and if not you'll get the help and advice while you're there, so to speak.
:hugs: for you.