Cycles getting longer?

Jenny • Late 20's. TTC #1 Recovering from 2nd miscarriage at 6-7 weeks.
Hi All,
Has anyone had experience with their cycles getting longer? My cycles are normally like clockwork at 29 days. But the past few have been getting progressively longer at 33-34 days. Typically, they are only 2-3 days long too. 
Both my husband and I Are 28/29 and healthy and have been ttc for 10 months. I had a very early miscarriage back in May. Trying to remain positive but it's starting to get very frustrating it doesn't seem to be happening for us. I've been using OPK's, tracking my cycle and trying to do the deed in the fertile window. 
Best, Jen