18 days late !!!

Hi ladies, so on May I was late for 3 day and I got my period on May 31st so I was relief because I have a 9 month old baby girl. So I was supposed to have my period on June 30 but I didn’t now its July 17 and I’m really late I been having cramps or so but no period and a little sore boobs, urge to have sex and I have to pee so much but no period and negative pregnancy test. Within those late days I incident I was in the restroom and when I wipe the was a bright red spot but that was it no period. Just wanted to know if anyone had to go through this.