irregular periods?

For the past year my periods have been very irregular and very heavy and painful compared to how they use to be (I'm 21). They would jump from 30 days to 45 days to 36 days to 40 days and so on. Well this month my period actually started on my 29th day for the first time. And it felt completely normal. Normal cramps normal flow normal everything. I've had speculations of me being infertile because of how my periods have been, but could my period now be going back to normal make it possible to get pregnant? My s.o and I have been ttc this year with my irregular periods with not luck. Any advice or stories that relate would really help, needs some encouragement :(