Missed period, implantation bleeding, negative test!

Hello there, I was hoping I could get some advice. I’m rather confused about what’s been going on lately. My period was missed last month & I just missed it this month & I’m convinced I had implantation bleeding, it just had to be it felt NOTHING like my period it was very light not too many days like 3 if anything, the color was something of a light pink & light brown. As well as the cramps, my period warns me when it’s coming this just wasn’t it, the cramps were light. I’ve never been pregnant before but my husband & I have been trying for about a year now. Anyway, It’s been a few weeks now I’m on the 3rd week after all of this the light bleeding happened early January & I still have a negative pregnancy test. I’m wondering if my HCG levels might be low I’ve read plenty of stories, I don’t know if to get a blood test, if anyone could please just shed some light. I’d extremely appreciate it!