@BVIre - It does feel hugely over whelming but I promise it settles down.
So, first trimester you may feel exhausted and get some sickness etc but just remember if you're really struggling to call your GP. You don't have to suffer!! (My first pregnancy I spent vomiting multiple times a day and not keeping anything down - assumed it was just part of pregnancy. Eventually got given antisickness when the GP found out how bad it was and it was a total game changer!)
You'll book with the midwives and have a "booking" appointment with them. It'll be a blood test and you'll also go through everything about your health, babies fathers health, etc and they'll answer any questions you have. My trust do this as two appts. One on the phone to gather all the information and one quick one in person to draw some blood.
Then you'll have an appointment for your 12 week scan sent through to you.
Remember you're entitled to these appointments as time away from work. So don't stress if it comes through and you're working - you just need to have a chat with your boss.
Beyond that you'll have appointments with the midwife at week 16 and they'll measure your belly, check babies heart rate, dip your urine to test it, and just check you're all fine.
Then at 20 weeks you'll have another scan.
After this, midwife checks are exactly the same as the 16 week one but happen more regularly. Are you in the UK?
If so, this will outline all your antenatal care:
www.nhs.uk/pregnancy/your-pregnancy-care/your-antenatal-appointments/
During the first trimester, if you're feeling unwell, have any concerns etc then your GP can refer you to the Early Pregnancy Assessment Unit (known often as EPU or EPAU) if they deem feel, or they can treat you for things such as sickness etc with tablets.
Food wise, this is a good list of foods to avoid when pregnant;
www.nhs.uk/pregnancy/keeping-well/foods-to-avoid/
You can keep going with normal activity for you but may find you're a bit tired! So follow your body's cue and take a nap when you can. I lived for first trimester naps the first time round.
Is there any specific question you have about the first trimester?