TMI - Bleeding after sex

So we had sex this morning, first time since finding out I was pregnant about a week ago. Afterwards I went to the bathroom and there was some bleeding, light pink in color. I was also having some mild vaginal discomfort. I put in a tampon for about 10-20 minutes before I read on the internet you shouldn't do that so I took it out (no blood on it) and put on a pad. I guess we'll see how today goes. I'm super nervous. We were going to go to the pool but now I'm not so sure.