Cycle change since TTC

Before we started trying, my cycles were 29-31 days and pms symptoms were relatively normal or the same cycle to cycle... since trying my cycle has been 33-36 days and my pms symptoms vary greatly month to month. I usually spot for almost a whole week before it starts (used to be 3 days) it sort of seems like its getting out of whack from being stressed about getting pregnant.. was wondering if anyone else has experienced this. I haven’t been on hormonal birth control for at least 12 years now and have a drs appt the end of May but looking for peace of mind. Thanks!