I desperately need answers, help!!

So me and my boyfriend have sex every single day. Sometimes twice a day. I am not on birth control and we rely on the pull out method, although he did come in me on the 21st and 23rd of April.

Last night after we finished having sex, my boyfriend noticed I was bleeding. I immediately looked at my app as it hadn’t seemed like long since I had been on my AF. That’s when I noticed it had been right at 2 weeks since I had gotten off of it and that threw major red flags !

My periods are completely regular and are always on time for the most part. My usual cycle is 28 days. So after going to the bathroom, I put a pad on and went about my day thinking that maybe my body was just off. Keep in mind that I would only see blood if I wiped. It was a bright red/brown color and not a whole lot !

I wore the pad all day yesterday (the 1st) and also to bed. There was nothing but a few light drops on the pad and when I woke up this morning, I was not bleeding at all nor did it look like I did throughout the night.

So I lightly spotted for a day and that’s it… according to the dates below and when I am suppose to actually start my AF, could this be implantation bleeding? I’ve never had anything like this before this early on..

TIA !!