Concerns

Hey guys so it's been a whole month that I haven't had my period and its August still haven't received it yet, I did a test but it was negative, but I have been tired and feeling bloated. Should I be freaking out about this? Also I spoke to a nurse and I have to wait 2 to 3 months without my period to see my doc. Also I have put on some weight and I'm not too fond of eating as much anymore