Severe depression

I normally struggle with depression and anxiety. I take medication for it but I'm still getting used to it so I haven't always remembered to take it. I've notice a pattern where before and during my period, my depression spikes to the point where I even get extremely suicidal. I'm wondering if me forgetting to take my meds some days is messing with me or if it's just my period that's affecting it. Thoughts or advice?