*already had period and am regular *

Jessica

I’ve already had my period this month and am very regular. Me and my SO had sex a couple days ago and since then I’ve had nausea and real bad stomach pain down near my vigina. Well for 2 days now after I pee I have this red show then it will go away. Could that be a sign of implantation? Or something else? Kinda nervous to take a pregnancy test till next month.