Initially, I Felt A Shar,. Sudden Pain On My Left

Initially, I felt a shar,. sudden pain on my left hip after I lifted my baby and pressed her weight on that side. It would go away after a few seconds and I thought it was just nothing. After a few weeks, the pain didn't come back, I thought it was because I have stopped pressing weight on it but I noticed a lump near my left hip bone while I'm lying down. Few of the changes I noticed since then were I am more constipatied and feelings of slight pain on that area even when I'm just standing . I'm 27, female, I'm wearing Implanon so I don't get any menstruation. Thanks.