Pregnant and freaking out

Hi ladies! My husband and I had a little “oopsies” a couple weeks ago. I took Plan B, but just found out today we are in deed pregnant with baby number two. I feel so terrible for thinking this, but I didn’t want this baby. Our daughter was born Dec 1st and I just feel so guilty like I’m taking away time with her. Did any of you ladies feel that way when you found out you were pregnant with your second? I hate feeling like this. Also, anyone know about the effects on a pregnancy after taking PlanB and it not working? I assume everything will be fine. I do plan on calling the doctor Monday. Just thought I’d reach out for some support here. Thank you all in advance!