anyone experience very early pregnancy symptoms?

This may sound a little crazy but I'm driving myself mad thinking about it!!
Me and my fiancé had unprotected sex 1st Jan (I was due to ovulate around this time) and I seem to be getting quite a few symptoms already.
Obviously I don't know if it's just PMS stuff as it's too early to test but I just feel "different" this time. I just can't put my finger on why.
I've been having the following symptoms for 3-4 days now...
Bloating
Stomach cramps
Nausea - in the day and also waking in the night with it quite bad
Extreme tiredness - having to take naps during the day
Peeing so much?! Like I've been 12 times today but not drinking any more than usual?
Also (sorry if TMI) but really gassy and quite constipated
Anyone else have these symptoms really early on in pregnancy? I'm trying not to get my hopes up too much as I know a lot of them are similar to pre menstrual symptoms xx