Assuming you've been married to and living with your US Citizen husband for a full three years, and assuming he's been a citizen the entire time, you can probably apply now. You can apply 90 days before meeting the three year "continuous residence" requirement, if you meet all the other requirements at the time of filing. See the
M-476 for details, especially the box at the bottom of page 22.
A week long trip outside the country will not present a problem. You do need to report it in the space on the N-400 where it asks about trips you've taken outside the US, but that's all. It doesn't disqualify you from naturalization; you didn't have to report it earlier, you won't get in trouble about it.
Again, you can see the M-476 for details. Long trips out of the US could have caused a problem with the continuous residence requirements, or a whole lot of short trips put together could have caused a problem with the physical presence requirement, but a single week long vacation isn't an issue at all.
If you take any other trips outside the US between now and the time you actually get citizenship, be sure and keep a record of the dates, so you can tell them about the trips at your naturalization interview. Again, short vacations won't cause a problem.