You can certainly get pregnant from fingering if the inserted finger(s) had semen on it/them, and it happened at a fertile time.
Where did his cum land? How did he clean it up?
However, timing is critical.
- What date did this sexual activity take place?
- What were the dates of your period starts in Jan, Feb, Mar, April?
- What were the dates of your periods expected to start in Jan, Feb, Mar, April?
- What was the date your period was expected to start in May?
- What do you mean by "My period is usually late" How do you decide they are usually late?