SO scared and nervous.

I am in q LDR. We met online when we were 13 and 15 and stayed together for years, our parents wouldnt let us meet underage, but now we are twenty three and twenty one and are finally meeting in TWO days. Im super nervous because getting on birth control made me gain ALOT of weight. I use to be tiny but now i gained alot of weight so im scared he wont like me as much. He told me he loves me no matter what and if i feel fat then we will work on it together. Any tips to calm nerves??