Is my period early or is this normal??

Kelly-Marie • 👼🏼mumma to 3 angels 🦑🐨🐼👼🏼 Praying for my🌈

Hi all quick question as I’m really not sure what’s happening.... I had my second MTX injection last Friday and on Monday my bloods had dropped from 5700 Friday to 3400 Monday so there is no way I would be back to 0 already surely? However I’m experiencing my normal period like symptoms along with the start of what looks like period bleeding? Is it too early for my period or is it just the injection? How long did it take others to start their periods after the injection? Thank you for any help☺️💜