You should consider taking a pregnant test just in case. You can easily pick one up at the store
It's really unlikely that you'd get pregnant from fingering. While never say never, it's next to a never in terms of really happening in the real world. Penis in the vagina is how pregnancy happens. Women are late from time to time because of a variety of reasons such as being stressed, changes in routine, weight gain or loss, illness, etc. Wait one week to see if you get your period. If not, I guess you can test for peace of mind but we typically can get an accurate pregnancy test 2.5 weeks after the sex we are worried about. good luck
Try not to get too stressed. Women will from to time have very strange out of the ordinary periods and it is just an off month typically.