Edibles, Alcohol, & Pregnancy?

So, before you go off on me, let me explain...

I'm 20 years old, and I used the Patch as BC for some time, but recently started having some negative side effects and decided to quit. I've been off of BC for about ~2 months.

Towards the end of June I went on a anniversary vacation with my boyfriend and we had unprotected sex where he ejaculated inside of me, so I took a Plan B the next day.

I just recently found out that I'm pregnant! But I'm super worried because during our trip I had one Angry Orchard (Alcohol) and a single edible (Weed) cookie. It was within days of my boyfriend ejaculating in me, but I'm still worried as I don't know how long an edible stays in your system.

I've already called a local clinic so I can get in on Thursday and have an ultrasound, blood work, etc. because my regular doctor won't be able to get me in for almost two weeks and I'm so concerned--I plan on talking with the doctors/nurses at the clinic about the alcohol and weed consumption.

Should I be worried? Do you think I could've harmed the pregnancy? I feel awful just assuming the Plan B would work, but grateful I didn't consume more than I did...