I worry loads and for gods sake do NOT google!! If you have any concern just ask on here or talk to a doctor or midwife but googling is a bad bad idea if it's anything that could in any way mean there's something wrong with your baby, because the only stories your brain will pay any attention to are the ones where that symptom DID mean there was something wrong. To be honest this isn't specific to pregnancy! I refuse to google any health symptom I have or DS has because you get worst case scenario results every time.
But I understand your worry and I do too. It's natural. I saw a thing online during this pregnancy that actually made me tear up a bit but reassured me that the way I sometimes feel (like I'm going insane worrying about baby!) it's natural, it said "you're that baby's mum from the moment you see two lines on a test and you will worry about them until you gasp your last". It actually helps me to realise it's just a normal and instinctive thing.