Missed period

Lisa

So never got a regular period and at 18 had a doctor prescribe me medication to bring a period on.. after that it was totally irregular I would get it once maybe twice a year.. I was diagnosed with PCOS when I was 23, and without trying I got pregnant at 25, I guess it was just the right time 🤷🏼‍♀️. Since then now 31 years old my period has been all over.. from May 21st to July 2nd I had my period for a month straight.. my doctor prescribed me metformin after listening to my concerns and desires to become pregnant again metformin is know to help PCOS. I have been on metformin since July 2nd and since i started the medication I get my period every month my cycle is usually between 19 and 23 days.. my last period started on October 2nd and I still don’t have my period, glow and my calculations are saying it’s late.. my boobs are sore and my stomach is more sensitive I took a test this morning but was only able to pee a small amount and the test was negative.. has anyone else ever experienced this? Possibility of being pregnant? anyone with metformin success, and what dosage? I was really hoping it would be a positive this morning 😩