Plz answer me 😔

I have irregular periods at times but before I started having sex the last few months I would have my period my the week of the 20th of each month

I had sex the 28 of September and it’s now October 22 and I still

Haven’t gotten my period

I did test on the 12th of this month ( in the afternoon around 5 o’clock after a long day of drinking water and liquids)

Both test came back negative

Now did I test too early, did I test at the wrong time ?

Or did the liquids dilute my pee ?

I’m scared to test again because I honestly want a baby I have hope that it comes out positive

Here is what I have been feeling

1. Sourness in my body

2. Back pains ( I’m kind of over weight for my age but it hasn’t really happen before)

3. Cramps no blood

4. Cm is clear and sticky

5. Tired (I do work )

I need some help plz someone tell me can it be my body transforming and getting ready

Or that I’m not pregnant

Has this happen to anyone

are those test right ?