Please respond!

My period was the 20th- the 25th. Me and my SO have been TTC our second for two months now. Well ive been having unprotected sex (obviously) every time we do the deed.

Now im spotting pink like i did with my first.

I read that its possible to become pregnant if your cycle is 5-7 days. Is this possible implanted bleeding? What was your experience? How early can you test after bleeding?