Advice/thought/insight...

My period is always within 5 days early or late on average.. I track my period using this app.. according to the app I expected my period last Tuesday. Saturday when I peed and wiped there was some blood, so I figure I’d be getting my period but nothing came. On Sunday I experience more of a flow so I assumed that my cycle was beginning. Sunday night I had pretty intense cramps right as I went to go to bed finally calmed down and I was able to sleep. Monday I continued to get mild to severe cramps (for myself, and I haven’t received cramps like this for awhile). Monday I barley bled and it was more like a spotting. This continued into Tuesday where it mainly consisted with spotting to a very very light flow. I took a pregnancy test came back negative but my family doctor ordered blood work as well. (My specialist receptionist is on vacation and did give out a number we could contact for emergencies but I am considering this an emerg). Overnight I did not bleed and so far this morning I’m continuing to just spot. Anyone experience something like this? Any thoughts???