Am i pregnant??

Me and my boyfriend usually use condoms, but a bad habit we’ve been getting into is not using a condom for like a minute and then putting one on. He’s never come inside of me though and i we didn’t not use a condom when i was ovulating (according to this app). However, this past week I’ve been kind of emotional, I’ve gained a pound or two, my nipples were a bit sore, and i woke up this morning with a little lower back pain. ALL of those symptoms *could* be attributed to other things though, like a lot of shit going on in my life, finally eating full meals regularly after losing weight b/c of restriction, PMS (my period i supposed to come next week) and i regularly wake up with muscle tension and pain because of the way i sleep. I took two pregnant tests last night and they both came out negative, but they could be inaccurate because my pee may have been diluted after drinking a lot of water and using the same cup of pee for both tests. I’m going to take another one in a week if i don’t get my period, but should i be worried till then? Please let me know your guys’ experiences or advice, I’m really stressed.