My boyfriend and I had sex last weekend (saturday) and Monday and today is Friday. It was protected (he was wearing a condom) but it was during my ovulation. On Tuesday, after that weekend, I was extremely nauseas also on Wednesday. And yesterday, (Thursday) I had brown discharge. Could I be pregnant and could these be symptoms already so soon? I am due to have my period around the 18th of June.

Let me see if I understand... You had sex on May 29, May 31 and today is June 4. Is that the correct time line?

Yes, that is correct.

Since that is correct, if you were pregnant, the ovum would most likely be implanting about now.

Implantation bleeding has not been scientifically proven, yet some women do experience spotting around this time.

You now need to wait to see if your period comes when due. If not, take a pregnancy test using first morning urine.

I did have some brown discharge yesterday afternoon and again a few hours later, and today I did have some pink discharge- just a little bit.

Also, supposing I am in fact pregnant, do I need to stop taking my daily medication? I currently take an anti anxiety medication (Lexapro) as well as an ADD med Adderall- should I stop taking these?
Should I avoid alcohol as well?

You need to check with your doctor asap.

I currently take an anti anxiety medication (Lexapro) as well as an ADD med Adderall- should I stop taking these?
Should I avoid alcohol as well?

RED FLAG! Why you asking about alcohol when you are on these other medications?? You should not be drinking at ALL on these meds...

I'm going to guess you are under 18 too?

I'm not trying to scare you, but for the love of god please, if you're not pregnant, get on the pill and Don't DRINK on anti ADD or anti anxiety meds... please take care of yourself and don't become another statistic (and another reason for me to pay more income tax)...

If you are pregnant... take good care of that baby and yourself, it's a blessing that sometimes comes when it shouldn't... Be careful!