Who had pinkish spotting and same after sex

Had pinkish spotting last week and it’s stopped now and me and partner had sex the other night and I had spotting again but in morning there was nothing. Could this be implantion I have never had this and we only been try for about 2 mths now and I don’t have anyone to talk to about this and not sure when should I do a test my period due on the 17th dec so was going to wait till then and give it couple days after that before I do one I am so scared cause if it’s not what be causing this I also had cramping on one side and body feels hot to round the time I had pinkish spotting and cramping can yous guys help out xxx