Welcome to the boards.
Are you up-to-date with your sexual healthcare, including STI testing? With bleeding from any kind of sex - and
fingering is a kind of sex - it's important to check that out and make sure an infection isn't the cause. Do you need any help or information about where to get that healthcare?
Beyond that, there's a few other common causes. The tissue of the vaginal walls is fairly delicate, and can get small injuries that bleed if it's treated too roughly. When you and he are having this kind of sex:
- are you already very turned on and into it before you start this kind of sex?
- are his fingernails short and neatly clipped, with no jagged edges?
- are you both being slow enough and gentle enough? Or are you experiencing any pain or discomfort at the time, or feeling like it's a bit rough?
- are you both using some extra lube?
Missing a period is no cause for concern. Periods can sometimes be late or completely missed, even for people who are usually very regular - it's just one of those things that happens occasionally! There's only a need to see a healthcare provider about missing periods once 3 in a row have been missed, or if there are other health issues happening too.