Advice??!

Caitlyn • I`m a momma of a beautiful 3 year old trying to conceive my 2nd
 I need some help. I never really have bleeding between cycles. My last cycle started the 29th of last month and so it's not due until the 28th of this month. My SO and I Have BD every other day since my last AF ended including last night. I woke up with pink when I wiped around 730 this morning and Now it's dark red (two hours later) I guess I'm wondering if this could be implantation bleeding already? According to glow, my fertile days don't start until tomorrow but last months cycle started 2 weeks late...now the bleeding is a dark brown and it's a little heavier. I'm now having bad acid reflux and my breasts are a liiiittle tender