Baby measuring small?

So I️ am 26 weeks and 2 days pregnant with a little girl. I’m also a first time mom. Last month I went in at 22 weeks for my “20 week scan” and my doctor told me my baby was measuring about a week small, but she was in the 30th percentile and was normal. She had me follow up for another sonogram yesterday to remeasure her. She is now measuring 2 weeks behind and is in the 23rd percentile. She said that as long as she stays above the 10th percentile she is fine and there is nothing to worry about. My fluid is also a little low but within normal limits. I️ eat and drink as much as I️ can (it can be hard because my baby is frank breech) and I️ take my prenatal and DHA but I️ feel like I’m still not doing something right. I’m just worried. Any other mamas go through this?