I did have sex june 9th unprotected and it was one of my fertile days
* also i usually don't feel symptoms like that in my period especially when im ending
Your best bet is the ultrasound i think then. If you went to the doctors they might not have been able to pick it up as you're still early. But the ultrasound will hopefully be definitive. Some women do get a lighter period the first month or so after conception, I know I did personally and when I went in they told me I was 4 weeks until we did the ultrasound and I was actually 8 weeks. Good luck!