You might also ask about whether you have an ovarian cyst on the left side. It wouldn't be unusual after a pregnancy began.
yeah ur little baby is so, so small u wouldnt feel it, u need to call ur ob it could be possible from not having a BM sorry for the TMI but that can cause like a lump feeling on left side
7 weeks pregnant your baby is about the size of a grain of rice, about 1/4 ". I don't know what the throbbing is, ask your OB at your next visit. Congrats!