Not sure what to think 😕

I am overweight and have been getting irregular periods for the past year. Usually my period is about 40 days apart. Last time I got my period was in April. There was a night two weeks ago I noticed I had discharge that stretched from finger to finger, on that same night we had sex but he pulled out. I was supposed to get my period on Friday but didn't. Today I noticed the same stretchy discharge again. My boobs also feel extremely full and my back has been feeling uncomfortable since yesterday. I took a cheap dollar store pregnancy test Friday and today but both came out negative. Does anyone know if this is normal? I feel like I would be happy wether I'm pregnant or not. But just not being sure is bugging me a lot.