PLEASE comment and help me if you can

I’m a junior in high school. My boyfriend and I have been dating well over a year and we lost our virginities to each other in July. He’s my absolute best friend and he has been for years, and we only have sex once or maybe twice a month. I started tracking my periods when I lost my virginity (in July). I guess there’s no way to tell for certain, but my periods seemed to used to be regular, always coming around the same day each month. The past 3 months, my cycles have been getting longer and longer, my last one being 44 days. It terrified me at the time (thinking I was pregnant even though we use protection) but now I’m just worried. I can tell i just ovulated yesterday, but the app expects my period to be in 4 days, meaning it will likely be 10 days “late”. The reason for my cycle getting longer shouldn’t be stress or weight gain, there’s been nothing unusual happening in my life. Except now I’m stressed this month because we tried practicing abstinence (we went from Jan. 27th-today sex free to try to see what my cycle would do) which just stressed me out sexually so we gave in today.

Can somebody please explain why my cycle is longer than usual, will I be okay? I feel horrible for everything, and I don’t know what to do. Please don’t leave hate, I’m just confused and scared.