I seriously need help!

Okay so it’s kinda a long story but here it goes. My fiancé and I have been TTC for about a year now and we had one chemical about 6 months ago. The last 2 months I gave up on trying to track ovulation and said it will happen if it’s suppose to happen. Well lately I have had strange things happening. I’ve been working on loosing weight the past 2.5 months I weighed 210 and I now weigh 190. A little bit under my belly button I noticed I had a soft ball like bump that I never had before, and I have started getting pressure in my pelvic area like something is sitting on my bladder and causing me to have to pee more than usual. Then 2 days ago I woke up and I had stretch marks on my pelvic bone area that I have never had before( picture attached) my period was suppose to start on a Saturday 2 weeks ago but it started that Sunday so it was a day late, but it only lasted about 3 days. My periods normally last about 5-7 days. And this period was heavy enough to fill about one pad a day but it was really thick and sticky like red snot. I’ve never had that before. And with the pressure on my pelvic area I have been kinda constipated, like I’m still going but not as much as I normally would. And I have been so hungry like I can’t control it and getting bloated or gassy feeling. So I took a pregnancy test today after work around 2:15pm and it was negative. WHAT IS GOING ON!!!😭😭