Ok practical voice here... your doc/gynae would/should have asked you when your last period was... and that would be the number of weeks give or take a week....
But from what you say, I would guess you are well into your first trimester already, about 6-7 weeks maybe less... its a bit early to actually notice anything, that usually happens after 12 weeks, when the little baby is formed etc..
Both of my pregnancies were a breeze, and the birth of the first one was a cinch... second one decided to be difficult...but then again he was born on Halloween..

Like Bee said plenty of folic acids... if you don't want to take pills, then eat lots of green leafy veg like spinach for the iron also, and Kiwi for Folic acid. Rule of thumb is to generally just up the healthy eating not only for your baby, but also for yourself as it will help you afterwards too.
Try to cut down on smoking or quit altogether... rule of thumb here: Babies from smoking moms generally have a lower birth weight than those of moms who don't smoke...
You can still drink alcohol, but limit it strongly to red wine and one glass only at any given time.
For nausea/morning sickness: I had it for 1 week with the first one, and not at all with the second one.. Trick - eat more but smaller meals... so instead of eating three regular meals, eat five or even six smaller meals throughout the day. Avoid junk food, as this will trigger bloatedness and heartburn, and could cause nausea as well. Have ginger biscuits at the ready. Ginger help to alleviate the feeling of nausea.
And ja.... just enjoy it!!!! involve Tal. Its important that you both have a part in your child... you both made him/her so I think it goes without saying that Tal also needs to enjoy the pregnancy...
Yes we do go through a rough patch emotionally in the beginning, but this will pass as your body realises what it happening...lol. Remember its a shock to the system, and it needs time to accept the changes..
Very important!!!! do not change the cats litter box without wearing gloves... you will be running the risk of toxoplasmosis which could lead to a miscarriage... so just be careful.

Or get Tal to change the litter box.. hehe.
And remember pregnancy is not a disease... you can do everything you usually do, and try to walk a lot etc.. it helps to strengthen your pelvic muscles which will help you during the birth.
Relax, and enjoy!!!!