Longer to conceive 3rd baby

Did any other moms seem to take longer to conceive third baby ? With my first pregnancy at 20 I got pregnant first month with my second at age25 I got pregnant second month and now we just went thru month 5 and still not pregnant yes I do know it’s normal but just doesn’t seem normal for my body ! Little back story I was on Mirana for 1 year and then on a regular pill for almost a year but have been off it since July and my periods are normal I’m just worried the Mirana messed something up