Just had my tubes untied about 6 weeks ago , and the last two weeks i've been feeling pressure in that area, and just 3 days ago i noticed there is a bump right above the pubic bone,only when i stand up, i cant feel it laying down,and not really any signs of pregnancy, but i never had any symptoms with my other pregnancies either.. i've take 2 pregnancy tests both negative, and my period is due in three days, feeling a bit worried, any suggestions