Hi Suman!
The short answer is, NO, a person cannot become pregnant by inserting a finger with sperm on it into the vagina. This is because sperm are extremely fragile and aren’t going to survive outside of the body long enough to cause pregnancy even when reintroduced into another body. If you are feeling anxious about pregnancy in these situations, try reading this article -
You’re Not Pregnant, Why Do You Think You Are? If none of the situations in this article apply to you, you can try reading this article -
The Pregnancy Panic Companion.
It sounds like (and as the name of your post implies) you are struggling with a lot of anxiety surrounding pregnancy. Do you want to talk more about why you might be feeling so much anxiety around pregnancy, or how it is affecting you? Is there anyone (friend, family, therapist) who you have been able to talk to about this anxiety?