Is it possible to have implantation bleeding if I was 6 days late on my period?!

Hello everyone! I am new to the forum and I apologize that I'm unfamiliar with the lingos. Lol. My cycle is usually regular, 28-30. I use a tracker on my app to track my cycle. I had my period in November (17th-21st) like normal, the usual 5 days of heavy bleeding the first 3 days and the last 2 days, it eases up. I usually bleed VERY heavily. Like clots, getting it everywhere when I use the toilet and having to change my pad maybe 2- 3 times a day. I had my period like normal in December from the 15th- 19th. I had unprotected sex with my boyfriend on the 18th and then the 31st. We had sex again on the 1st, 7th, 8th and 9th. All times unprotected. Now, my period was supposed to be on the 12th-16th and I completely forgot about my period so then this past Monday, I remembered that I hadn't had my period and checked my app and saw that I was 5 days late. I was curious and took a test and it was negative. Tuesday morning, around 1230am, I went to pee and when I wiped, I noticed a slight tinged of red. I had very, super light cramps and a pinchy achy feeling in the middle of my lower back. I didn't think much about it. When I finally woke up and used the toilet again, it was reddish and slimy. That was day 1. Day 2 and 3, it's been reddish brown, rust colored if you will, and it's so super light. Almost watery. Not enough to soak up a pad completely like I usually would. Like I said, my period are super heavy, full of clots and I get bad cramps. If I were to guess, all the blood I have lost the last 3 days wouldn't soak up 1 of my overnight pad I wear. So, does anybody have a guess?! I have been Googling up a storm about implantation bleeding and reading about other people's experiences. Yes, I do want to be pregnant as we have tried for years in the 11 years we've been together.
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