My Husband And I Have Been Trying To Get Pregnant

My husband and I have been trying to get pregnant for about 2 years. We're just now starting in vitro. I don't ovulate regularly and my husband has low sperm count. I went in today for a vaginal ultra sound and my doctor called and said I had a thickened uterine lining and now wants me to come in for a blood pregnancy test. Do you think I could be pregnant? I took a home pregnancy test and it was negative