I am 32, on hrt & had a positive ovulation 11/11 (blood test 77). i have been spotting brown and pink since 11/18. could this still be implantation?

One cannot tell yet: Wait. A positive pregnancy test can tell a woman that prior spotting was actually implantation spotting. It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a reliable result about 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period.