Orgasm disparition

So lately (since about 4 months) I don't orgasm anymore during sex with my bf. When we first started having sex together so 9 months ago I did but now I just doesn't happen unless he eat me out...

I noticed that about the time I "lost the orgasms" I went on the pill and we stopped using condoms

Do you think there's any link or it could be something else?

Did it ever happened to anyone?

Do you have any advice to help me? I don't really want to go back to only condoms as birth control...

Ps: this problem is seriously beginning to put my relationship in danger....