I could honestly have written your post myself.

When I fell pregnant with this bub, I was sure it was a boy - MAJOR cravings for red meat, aversions to chicken, savoury over sweet and all the other things I have had when carrying my other 3 boys.

We went for the scan at 19w2d and the baby was straddling the cord. We got in to all kinds of positions only to be told in the end that the sonographer thinks it is a girl based on the fact that she couldn't see a penis... but, she also didn't see the 3 white lines so really couldn't be sure.
I left a bit disheartened to tell the truth. Not only was this the first time EVER we asked to find out the gender, but we were none the wiser really and I was told the bub is more than likely a different gender to what I was feeling.

Now just over 5 weeks later I have my head wrapped around the fact that there is more than likely a little girl in there. I am happy about that - now.
I am having a 3d scan done in a few weeks time where I am hoping to find out the gender, but I am not holding my breath that we will, and this time I am happy for it to be either gender

I wish there was some way for you to be able to get your scan done again. Hopefully your results come back saying they were unable to see something properly and you'll get sent for a repeat scan
Are you able to get a 3d scan done at a later time?
Sending you big hugs