Implantation spotting 5 days late then bleeding

Brooke • 💙 Ryley Dan 27.01.18 🩵 Darcy Jay 18.05.21
I usually don't go over 10DPO so I was already 2 days late... from ovulation I've had super heavy creamy cm with bits of clear stretchy stuff in it and dried up abit a day before what I was sure was implantation spotting 12DPO wiped once and it was pink creamy cm with a spec of brown and then nothing for days and the symptoms kicked in.
then today 15DPO I started to bleed dark brown watery blood as soon as I woke up only filling half a reg tampon twice a day. Not sure how long this is going to last.
Now I don't know what's going on? I was sure I am pregnant but couldn't test yet as it takes 4-5 days after implantation to get enough HCG for a pee test!! I've never been late or had spotting. Also having pregnancy symptoms like sore boobs, cramping, pinching, heartburn, feeling abit nauseous and tired etc
All I can think is it may be a Chemical pregnancy and I just didn't have enough hcg yet for a positive test.
Or I could still be pregnant and I'm having break through bleeding?
I'm going to test tomrow as I'll be 4 days after implantation just incase there's a miracle 🙏🏼
What are my chances of being pregnant?
Has anyone had anything similar? 
TIA xx

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