Using breastmilk on a pregnancy test??

Have any of you guys ever tried taking a test with your breast milk while you’re pregnant or not pregnant to see if it turns up positive or not ?

They say HCG filters out through blood, the kidneys AND breast milk.

So I’m 3 months post partum from my 4th. I’m a very fertile person. And my first cycle was late November maybe mid December cause i had some spotting then too. But it never came back, I’ve just been spotting on and off (just like one wipe of brown when going to the toilet every like two weeks) . I had my birth control appointment and they wanted to wait to start me on it until i started my period.

He has not finished in me at all.

All my tests have been negative thus far. So i took a urine test with a one hour hold (which was dumb) and it had a very questionable squinter. Nothing convincing obviously.

So i tested my breast milk (mind you i have tested my breast milk the last couple months and all negative)

So since i had two more first responses left, i took one with my breast milk, and faint positive.

Today i had a wipe of light brown spotting. Just once and I’ve been cramping all day as if I’m on my period. I’ve been having STRONG cravings this past week. Mucus plug like disgcharge and I’ve been distant (which is a symptom for me when pregnant)

What do you guys think? I’m going to retest with pee again in the morning