Suggestions???

I had my daughter when I was 15. I'm now 21 and married...❤ My husband and I started dating in 2012 and got married in 2015. We decided it's time to have another baby!!. Ever since we met I have been on birth control ( IUD ) I got it taken out March 2, got my period on the 6th. We have been trying to conceive. I'm currently 1 week and 4 days late I have been taking pregnancy test and they come out negative... any suggestions as to which pregnancy test are better or should I just see my doctor.?? And what positions are better to use when trying to get pregnant.???