Anyone out there who has fallen pregnant even when having really long cycles? i.e. 41-57days long?

We have been trying to ttc for 7months but in this time just had 4 cycles. Im npretty sure I ovulate late in cycle as OPK's show positive and hae done BBT for a cycle. Im taking Vitex to help shoten cycles. Should I be worried that cycles so short? or is there hope for me?