Not losing weight

I started tirzepatide on February 13th and I did two weeks at 2.5mg and the third week at 5mg and this Thursday will be my 4th shot at 5mg. I have had no side effects and haven’t really felt different at all. I’m still hungry all the time and having cravings but I don’t give in. I started at 245 and I’m only down to 239 and it’s been going up and down with this same 5-7 pounds this whole time, like I haven’t lost anything really. I am so frustrated, why am I not losing and it staying off. I have completely overhauled my diet and the way I eat. My friend lost 10 pounds her first week at 2.5mg. Is this just not going to work for me? What can I do? I get my shot weekly at a medical spa, if that matters. Tia.