Is this just the baby starting to grow or water sac. First time being pregnant and I'm fifteen almost sixteen years old
If you are really skinny it could be your expanding uterus that you are feeling but I'm not sure that it would be described as a lump, it just usually feels a little harder than normal. The baby definitely isn't big enough to be a "lump" at 6 weeks. On another note, some types of tumors can cause a positive pregnancy test and that would feel like a lump for sure if it was located in your abdomen. You are really young so anything like that, that you would worry about, you should probably see a Dr to make sure if things are or are not ok. Have you been to the Dr or had an ultrasound to confirm pregnancy?