Ok so I got my period right at 4 weeks postpartum and it has been very consistent for 4 months. I am now a few days late. I had slight cramping late last week and thought it was going to start. I took a pregnancy test on Sunday and it was negative. Should I take another one? I know your cycle can be funky PP. I am supposed to go get the IUD put in next week and I just want to make absolute sure there is no chance of pregnancy before hand.