Yes, but you will need a doctor to confirm the pregnancy. You may also qualify for Medicaid too. Don't let others bully you. It's your decision to decide what will be best for you. There is help for whatever you decide.
My mom had a pregnancy at 16 and aborted and she never regretted that decision.
I had my son when I was 19. Best decision of my life, but thankfully I didn't let others push me around to abort or adopt out. It was hard and I've been lucky in some ways, but I don't regret being a young mother.
I do want to warn you that there is a scary amount of childless couples, religious fanatics, adoption agencies who will try to talk, shame, and guilt you out of keeping your child. Open adoptions are almost always changed to closed adoptions with your baby across state lines and a worthless open adoption "contract". More money doesn't mean better parents. They'll try to force you to sign your child over shortly after giving birth, and there is plenty of time after your child is here for you decide to adopt out.
You don't want to go to one of those false Planned Parenthood centers that are just a front for an adoption agency or pro-life/anti-choice group to pressure you into saying you won't abort or will adopt out and force you to watch mocked up "abortions".
It's not a fetus until second trimester and it looks like a deformed shrimp earlier than 16 weeks (trust me I've had miscarriages that were intact). Then it is more scary alien looking thing and doesn't look baby like until 32 weeks. My daughter was a preemie and she still had the freakish alien look at 33 weeks, but too cute for her own good now.
You are only 3 weeks so you do have time to think over your decision and decide what is best for you. In Illinois abortion is legally allowed up to 24 weeks. It used to be until 28.5 weeks, but the partial birth abortion ban was made law at some point between my two pregnancies with living children.
I've had my OB/GYN for the past like 10 years minus the short stint during my 3rd pregnancy because I had to switch for my high risk pregnancy and the Level 3 NICU. I highly recommend Personal Women's Health Care with Dr. Pozzi, Dr. Forcier, and Dr. Winkelman (it's okay I still giggle like I'm 12 too). I trust each of them with my life and a few times it did come to that. Excellent doctors but they aren't in the city, but they have saved my life a few times and the other women in my family. I started seeing them when I was 15 before I was sexually active.
As a former teen mother, I offer sympathy, hugs, and congrats. It can be a true blessing, a huge mistake, or something in-between, but whatever you decide just make sure it is YOUR decision. Gather your support system and leave the haters to hate. On the bright side many hospitals offer free breastfeeding, baby care, and labor/delivery classes to young mothers. La Leche League is free for help and support for breastfeeding.
Talk to the baby's dad and both sets of parents after you make your decision, about what kind of support you would like from them, and what support they can give you. Be prepared for any reaction including you might be on your own or you'll get support from unexpected places. However luckily you can find more support nowadays regardless of what choice you make. FYI- I got the BFP at 3 weeks pregnant when I was pregnant with twins, but YMMV.