could it be?

Areli
Ok its kind of a long story but here it goes: I've been having my periods every 24 days for the past 5 months or so. Right after Christmas I was diagnosed with type 2 diabetes and started taking metformin. I got my period Jan 2 and was supposed to get it again last week Tuesday. But no period at all has come. I took this test today because my boobs and nips have been sore and sensitive. But I don't see two full ted lines. What do you guys think?