Implantation spotting?

Meagin

Had sex on the 27th of nov and 1st of December. Started having brown discharge on the 3rd and just tonight I saw pink and brown on the paper. Also this morning woke up with really bad nausea and headache.. headaches I get all the time but the nausea was the weird part.could it be implantation or something else? My cycles are usually around 34-35ish