Right, I was just mentioning it in case you or anyone thought, "well if EPO does it, I'll switch to flax"
Your PERIOD can't be late from EPO, your period is late because you ovulated late. If you didn't start the EPO until after ovulation, then your period is late for some other reason and you need to take a pg test ASAP, and if you DTD unprotected thinking you had Oed, you might have gotten pg from later in the month.
EPO is usually taken Af-day before O to prevent it delaying ovulation but can be taken all month long in months you aren't going to be TTC.