After having sex i seem to have a light bleeding, when my bf cums inside me he goes deeper, could it be he is bumping my cervix during that time?

You need an exam : Irregular bleeding is one of the most common problems obgyns treat. If this is one time problem it usually resolves on its own. If this is a recurring problem you should be evaluated. Infections & hormonal changes can cause spotting. If there is a concern for pregnancy then do a home pregnancy test . There are many options available to help regulate the menstrual cycle. Schedule a visit.