As others have mentioned, succeeding on a first cycle in your mid-40s with an embryo that hasn't had testing for chromosomal abnormalities is unlikely. Even if your fertility is good and you're at a good clinic (this doesn't sound like one), you're looking at *minimum* three transfers to get pregnant.
I think you need to see a clinic who can give you an assessment of your likely egg reserve and might be willing to do PGS to check whether you are actually producing any chromosomal normal embryos.
Just as a counterpoint to the people urging DE or natural cycle IVF for everyone near/over 40, in the world of 'fertile' women, 40+ is *not* too old to have children, and people have repeatedly laughed at me when I said I went to IVF at 39 because I was 'too old' to try naturally. The problem is that, for many ladies who end up having fertility treatment for a first child at 40, their main problem is age related. This skews the discussion quite a bit. In the wider world, lots of women who have conceived naturally in the past have second and subsequent children in their 40s.
To give an example, aged 39, I got 12 eggs on a high-stim cycle of which 7 were mature, 7 reached blastocyst (5-day stage) and 6 were suitable for freezing. Out of those, unfortunately, only one was chromosomal normal - due to my age - but statistically I could have had anywhere between 0 and 3 normals. I'm probably similar to the 'average' 39-year-old woman, I was infertile in my early 30s and the cause appears to be a life-altering autoimmune/inflammatory disorder - my egg reserve/quality is probably affected by my disease and I did conceive (eventually) naturally at 36 with immune treatment.
It is potentially possible that you can conceive with own egg at 44, but you need to be realistic about your chances. It is possible you do have severely-compromised egg quality - and that's your major issue. To find that out, you need to be at a clinic who do relevant investigations, don't waste your time and money on cycles with a limited chance of success, do regular monitoring of issues like lining thickness, and are realistic and unbiased about your *individual* chances (not just population-wide stats).