So I'm on cycle day 46 aka I didn't get my period this past month. I've never had this happen. I've been seeing this guy for about 4.5-5 months and he was nothing but supportive when I said I'm late but 99% sure it can't be from him. I'm always within 28-30 days. Anyway as a precaution I took a test the other day and I'm negative. I've been put on a new medication about 2 months ago, Effexor XR for my PTSD, could the missed period be a side effect of the mediciation switch?