Blood pressure & medicated cycle

Manda • Ttc since 2013. Fertility treatments at CNY fertility January 2016. 3 Timed intercourse with letrozole. BFN 1 IUI bfn. IVF 1 transfer BFn 6 frozen. FET#1 2 transfer BFP (2 stuck, 1 split) Triplets BBG
So this is my 3rd cycle on letrozole just took my trigger hcg on monday. We did timed Intercourse. Today friday I started feeling light headed so I took my Blood pressure. I have high blood pressure that is medicated and have not had any trouble for awhile. But today my BP tanked. Its super low and has been for a few hours. Has anyone had this happen to them? Its not so low that I need to see a doctor but its way lower than normal. This did not happen any other cycle.