Hi, I hope you must have confirmed your pregnancy
duration by an ultrasound
scan. If not go for it to make sure all is well. As some of early pregnancy complications & multiple pregnancy may present with a uterus
larger than expected. Also, get one urine DR done to rule out any urinary tract infection
, which may be causing the "ache" & the "bump" because of sub-acute retention. This is more likely if you have any urinary symptoms. Otherwise it may be some extra abdomenal fat becoming more obvious due to relaxing effect of pregnancy on abdomenal muscles. Take care & good bye.