Irregular and pregnant

AF only comes every 90 days , and I'm pregnant first week of June I was feeling very nauseceous so I took a couple test and both were negative , so it goes away and two weeks later it's back only this time my head is in the toilet almost every morning and evening before bed so I take a test and it comes back positive ! And then I take another one and it's positive an then I go to the local women's clinic and positivie again ! So we are pregnant first time ever I am so paranoid it's hard to rule out how many weeks so my on said at the apt we will do hcg hormone level blood test and ultrasound to determine , u till then I have bought a months worth supply of pregnancy test for each week lol so far still two very dark lines !