pregnant and superanxious

Alexa • Wanderess. Mom to a perfect daughter. My son's heart only ever beat under mine.
Hi everyone! My husband and I decided in Dec we want to have a baby and were thinkining of starting to conceive this summer. Surprise surprise though, I just found out Im pregnant two days ago... 4 weeks and a couple of days. 
We are STUNNED. He was happy but a bit shocked (I think it hasnt sunk in yet) and I am freaking out. I am so so freaking scared, the timing is not ideal (I was supposed to sit a board exam I can only take once a year at the end of Jan 2018 and thats exactly my due date). We are completely unprepared (apartment stii a mess we wanted to renovate a bit before that), no previous visits to the doctor... I have anxiety attacks every day sonce I found out, Im just... beyond scared :( when we decided we want to have the baby I also had sime sleepless nights but then got excited and happy at the prospect. Right now Im just so overwhelmed, and I feel like we havent managed to let it sink in and I just dont know. There is a part of me that is happy and another that is just freaking the hell out!!! Anyone care to give some advice please?