Don’t know what I have

The night from Thursday the 8th on Friday the 9th I have had foreplay with a boy, no sex.

I don’t use any birth control yet.

The first day of my last period was 23th July and my cycle length is +-26-27 days

So normally I don’t have that much chance to get pregnant, but you never know.

I’m a little scared now, since Sunday I have a watery consistency in my panties, looks like pee but a little sticky and colourless, and since yesterday I have a weird and a little painful feeling under my stomach.

Especially today, the weird feeling is heavier and I feel bloated.

I am also feeling very exhausted since Sunday and sometimes a little nauseous.

I don’t know what I have, I just hope I am not pregnant! Could it be maybe from precum? Or are these just pre period symptoms or symptoms of an STD?

Please help me out :)