Don't stress out too much. Unexpected pregnancy is scary no matter how old you are. There's a lot of worry and concern that comes with being pregnant, especially if it's your first time. Don't take ibuprofin or aspirin. They can cut off blood flow/oxygen to your baby. Look into getting prenatal vitamins and take them daily. Start doing slight stretching/exercising more often. Walking is a great thing to do when pregnant, it makes labor a lot easier. Definitely start putting lotion on your thighs, stomach, upper arms, and back twice a day. This helps with stretch marks greatly. I hope some of this helped, you can inbox me anytime.
I think you also can't have ibuprofen or aspirin. Tylenol is okay though. I had headaches before and during pregnancy so was glad I could at least take Tylenol.
Get lots of rest and if you get queasy in the stomach, carry around crackers. It helped me to never have a fully empty stomach. good luck
Don't eat anything with raw or undercooked egg. Don't eat raw fish. Have your meat well done. Don't handle cats litter. Drink plenty of water/fruit juice/milk. Try not to have too much caffeine. A little bit is ok
Take prenatals beginning yesterday, no alcohol, no being near smokers, all of those are basics. See your doctor soon.