help please

Morgan
So I'm scarred I might be pregnant, I had a baby on August 27th. I stopped bleeding two weeks after. I started bleeding again on September 23rd and then it stopped on the 26th. Then I started bleeding again on the 30th till the 2nd. Haven't bleed since. During this time I was having unprotected sex with my boyfriend, and I didn't get my birth control until October 12 and it was the skyla. They did a pee test and I wasn't pregnant then. I've been very moody and my boobs hurt. Is there anyway the test they took at the doctors was wrong? And I'm pregnant