Advice on early AF /Chem P/ implantation

Courtney
My periods on like clock work every month . Last had it jan 3-6th& suppose to start jan 28th( short cycles) 
17th -spotted for only hour top after being intimate. 
18th -barely anything, super dark. Matches implantation examples
19th afternoon -BAM , heavy. 
20th-heavy 
21st-medium 
22nd-light- nothing
23rd- nothing all day , fri night , spotted one more time. 
Had back pain which never experienced & swollen breasts. 
I've been crampy since and suppose to start my period 28th & hasn't come yet. I'm pretty sure I started early or was a Chem preg but should I get checked by dr in case something wierd?? When to worry? Wait until feb cycle? Thank you 

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