ttc. 9 dpo and spotting after sex

hey. so kinda tmi then what im used too so bare with me... my hubby and i are trying to concieve baby #2 (we have a 3yr old). im 9 days past ovulation and we had some amazing sex today :) but he was huge down there today (more so then usual) and it was painful for the beginning portion of sex (which isnt unusual) but afterwards when i went to the bathroom to clean up i noticed the bright red spotting (which is normal, sometimes i tear a little bit from sex because of his size and how tight my muscles go down there). but i also noticed a dark brownish spotting when i first wiped. could this be implantation bleeding? i normally never spot brownish colour. even during my monthlys it stays red until the last day. what do you think? thanks in advance!