Opk help

Ok so abit of back story before the question …

I haven’t had a period for 6months I am a plus size women with a nearly 4 year old son. on the 29th December I started spotting when I wiped and have not been much more then that since (salmon pink in colour). I thought it was random so I did a opk today at 3pm and one at 8:15pm (first and second). I know they are not positive but they are really dark considering it could be a light period. I normally have really heavy bright red per

iods so it is very strange for me to have so little.

can someone please give me advise on what it could be.