Really normal. You get loads of discharge early on and it's usually that sort of really thick white stuff (though if you are taking vitamins, it is often more yellow ish because of the vitamins, which is weird, but anyway). The mucus plug builds up in 1st tri and also your body works overtime keeping the vagina clean and mucus is how it cleans, so nothing to be alarmed about unless you see blood (which also isn't necessarily something to be alarmed about but it can be). Have you had sex recently? You'll obviously also have more discharge that usually after sex too.