What Could Be Causing This???

So I've always had a pretty consistent cycle...over the last 2 years when TTC, AF went from 7 days long to about 5 days long and generally came about 4 - 7 days late. Recently, AF has been arriving 3 - 5 days ea4ly (length still the same). I'm wondering if this is something to be concerned about. Here's some recent changes in my life:

- started on anti-anxiety meds (about 2 - 3 months ago)

- started regularly working out

- started eating healthier (for the most part)

- been slightly more stressed at work

- change in my sleep (more tired from working out)

Any input would be greatly appreciated!