Advice please

UPDATE: today is 20th and I’m having less spotting. We’re hoping it’s implantation but has anyone gone through this and has gotten pregnant? My nipples are sensitive and getting weird cramps. Oh and only reason I’m asking is because even though my period isn’t regular I have never had spotting like this.

(Spotting went from brown to light watery pink back to brown.)

I’m late this month...I don’t have a regular period but I had a normal five day long period last month this month I was supposed to start around the sixth but I didn’t but on the 14th(valentines day) I started spotting today is the 16th and I’m having very light brown spotting.

Any ideas on what I can or should do?