Please help!!!

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Ok ladies, so the last 2 times I have wiped I have this small amount of blood. I am not pregnant. I haven't had a period in 5 months and was put on Metformin 2 weeks ago to help me start it back up. I did have sex yesterday morning, but the bleeding just started a few hours ago. I'm really hoping to start my period, is this the start of it? If it's not my period what else could it be??

The pictures are 2 seperate wipes.