There are several thigns that can happem.
First, it is pretty counterproductive to take estrogen AND AAS at the same time. Even progestin-only BC is silly to take with AAS. If you are looking to bring up your male hormones (by adding AAS) to help build muscle mass, then why would you also be supplementing female hormones? If you are serious about adding AAS, then you should get off hormonal BC.
Second, AAS can make some BC not as effective. Not always, but there is that chance. And getting accidentally pregnant while on cycle is not a good idea - AT ALL.