My acne is getting worse after using tretinoin A for 9 weeks, what do I do?

So what I am using is tretion in night and vitamin c product in morning for the 8 weeks. I don't really know what is going on but before On the 8 week I was using a vitamin c product to apply and ran out at the 8 week and after week 8, in week 9 only using tretion a, maybe cause the breakout, I am not sure why this is happening, HELP ME!