Pregnant

So me and my boyfriend have been trying for the first time to get pregnant. I have been cramping since a day or two after we had sex the first day and now my period is 9 days away and I'm cramping and peeing like crazy..

I went to urgent care to be checked for a útil since I feel it's too early to have symptoms.. nothing was wrong.

But it feels like my bladder is about to explode and only a little pee comes out and with my first pregnancy I didn't know I was pregnant until I had implantation bleeding and I still didnt get a positive until about 6-8 weeks they changed my due date 3 times that pregnancy.. is this normal ? Anyone else having symptoms at almost 3 weeks? Lmp 7-21 28 day cycle