I recently posted asking if my experience could have lead to possible pregnancy.

I recently posted asking if my experience could have lead to possible pregnancy. I'll recap my previous discussion. My boyfriend and I were engaged in an intimate experience with one another and simply did foreplay type activities. I gave him a ha****b and he finished using his right hand. He had cum on his hand. My both got up and washed out hand with cool water and soap and dried them well. He then used hand sanitizer and we waited for about 10-20 minutes before he fingered me with his right hand. I worry that because he used that hand I could possibly be pregnant. I also forgot to mention that my period came two days after the incident. Is there a possibility I could be pregnant?Thank you in advance for your advice.