So yesterday when I went to the bathroom I noticed some pinkish discharge on my liner & when I wiped…

So yesterday when I went to the bathroom I noticed some pinkish discharge on my liner & when I wiped there wasn't any. So just to reassure myself I went into l&d & thee doctor did a exam & checked my cervix & said she doesn't know where the bleeding is coming from , baby , my cervix looked good. So today I called my doctor & talked to the nurse & she said if it continues to come in & get seen . Well I went to the bathroom & this time it's bright red blood in my underwear but not in the toilet . So now I'm at l&d & they did an ultrasound & the length of my cervix is nice & long & close . I'm just so confused as to why I'm spotting ? Anyone else experience this?