So i have an IUD in and my period was scheduled to start feb. 2 2019. I am usually qlways withing one day of my estimated start date could be q day early or a day late. My period still hadn't come by 3 days late so i took a cheap .98c test from walmart and it was negative. I still had not gotta my period by 5 days late so i bought some walmart brand first response type tests i took the first one and it was invalid and had dye run and then i took the second and it looked to be negative. I am not 9days late and still have not gotten my period. Im really exhausted since 8 days late and my nipples have been getting in more pqin since being 6 days lqte to the point where if my bra rubs on them i want to cry. Last year in march i found out i was pregnant with my iud in at 6 days late for that period and i had a misscarriage. I dont know what to do i havent tested since 5 days late. Do you have any advice?