Confused about symptoms!

Hi all. I know I’m still very early at 4w4d but I’ve had fairly noticeable nausea off and on since Saturday and have been tired (though not as tired as with my DS). Anyway, I’ve also had what feels like gas bubbles and a dull allover cramp. Then this morning I noticed a slight layer of pinkish brown blood when I wiped. I don’t know why I’m so anxious about this, but wondered if anyone else had similar symptoms?