I'm 11 weeks+4 days pregnant and i just ate a southern chicken baguette where i asked to replace the mayo with mustard seeds. is it safe?

A sandwich?: A baguette is just a long narrow loaf of French bread. Chicken and mustard sounds like a sandwich. There are rarely any dangerous foods during pregnancy, as long as they are cooked (or pasteurized, etc...) to kill germs. If one was eating a healthy balanced diet before pregnancy, she can continue the same foods (which means too much mercury-containing fish would be bad, even before pregnancy).

Yes: It may be high in sodium so watch the amount of intake.

Yes: Yes, it is long gone by now through your digestive system.