Spotting?

AF left the building on the 18th so naturally we’re TTC.

On the 19th I got a positive LH surge and we DTD and what not all week every other day for the ovulation week like we’re suppose to. Anyway today I have some spotting going on, starting light pink, now later today it’s darkish? No cramping but I’m looking for advice if it could be implantation bleeding? I’m not suppose to get my period until the 11th