State law differs regarding DBA publication. Generally speaking, when publication is required, the DBA statement must be published once a week, in a specific newspaper that posts legal notices, for four consecutive weeks. Publication is included in the LegalZoom filing process.
If you are not having a period or you are having an irregular cycle, you can still get pregnant because ovulation occurs before your period, and ovulation can restart at any time. Young women can even become pregnant before their first period. There are no concrete physical signs of ovulation, so you could be ovulating and not know it.
However, some women have irregular cycles. If your ovulation takes place later than expected (mid-cycle), say on the 24th day of the cycle instead of around 14th day, and fertilization and implantation take place, then pregnancy can occur right before your expected period.