Can I be pregnant with kyleen insole?

Hi, Since 3.05 I have a kyleena insert, founded in the 5day cycle at the end of the withdrawal bleeding (two-component tablets Atywia), I had two cycles after 20days, the first menstruation was 5days and less abundant than before, another lasted about 8days and was more abundant. After the first month I had a visit and the insole lay perfectly. I still sense strings, but my breasts hurt, it's already 22 days of the cycle and I don't have another spotting. Previously, I had cycles while taking tablets in which my breasts hurt. I would add that the husband never ends up inside, and usually after a few moves he puts on a condom - we absolutely can not have more children. Is pregnancy possible? I would add that I have had a lot of stress recently related to changing jobs. When will it make sense to perform a possible test with 20-day cycles? Previously, I had a situation once that I did not have withdrawal bleeding, and the following month I had a stronger bleeding just. If I was pregnant, would I still have strings? Because somewhere I read that the inability to sense them might suggest a body.