Well I'm 27 and a mother if 3 ages 6,8,10 Recently me and my husband decided we wanted one more child It was then I realized I haven't got pregnant in 5 years I had no trouble getting pregnant with my 3 kids I was on mirena for 2 years but had so much trouble so had it removed I have had no birth control for 4 1/2 years And have had unprotected sex with my husband ever since and have not came out pregnant My period finally have gotten on track it took 2 years after mirena I have a period every 31 days Just wondering what could be going on