When you say upsetting symptoms - are you referring to usual pregnancy symptoms - like nausea, fatigue, bloating? If yes, these usually ease a bit when you reach 2nd trimester, or around week 13 - 14. From what I've read, sex is generally safe at any stage of pregnancy, as far as rough and long it's usually not specified in papers. As long as there weren't any bleeding, or contraction, your baby should be safe. When in doubt, always seek guidance from your OB.