Could it be implantation ?

Last month my husband and I found out we were pregnant with baby number two on August 19th. I started bleeding on the 23rd and turns out it was a “chemical pregnancy.” Well we celebrated our anniversary on the 9th of this month and did the deed on the 7th and 8th. The night of the 9th I had two or three sharp twingy cramps and then nothing. This morning my stomach was upset and it hit me all of a sudden out of nowhere and I almost didn’t make it to the bathroom (which happened to me when I had implantation cramping/spotting with my son) Could the chemical pregnancy have thrown me off and I may have ovulated early? Is implantation possible only four days after having sex? Help.