When May 26 came and I didn't get a period I started testing. I took 4 or 5 tests and today I took one as the last test before chalking it up to a breastfeeding thing. And it was positive. I got the clear blue predictor thing and it says I'm 4-5 weeks pregnant but when I go to a due date calculator it wants to know the date of my last period. So what do I do?