I just need to talk about it, please comment if you can..

I'm 19 and possibly pregnant. I've missed my period and tomorrow is suppose to be the last day of my cycle. I'm trying not to freak myself out because I know it will delay my period or make me miss entirely. My SO other and I are not ready but abortion and adoption are not choices for me. I'm just getting worried. My boobs have been sore for a few days now and I'm peeing more frequently. I didn't think nothing of it the first few days because I just thought calculations with glow might be off. I have Been a day or two behind my glow calculation before but not this far behind. The more I try not to think about seems like I think about it more. Idk, any advice? Or reassurance? It would be greatly appreciated. Thank you.