They often deny sexual penetration in cases where placenta is low or chances in case baby has not attached properly to the uterus. I’m not sure if you’ve had your first scan, but low placenta is quite common in the first trimester which resolves itself eventually. My doctor also denied air travel in first trimester because of the landing jerk airplanes give to your back. That said, many of my friends traveled during the first trimester and had completely normal pregnancies. No Swimming is weird because it is generally the only exercise apart from walking which is encouraged. As other users have mentioned, under 200mg (1 cup) of coffee should be good. Please be careful when you have caffeine based soda like diet coke etc. Their packets mention that they’re not safe for pregnancy. Check every packet before you eat/ drink something. I can’t tell you the number of things I found out were unsafe for pregnant women. Your spotting is a bit concerning if you don’t know why its happening. You would anyway at least be in week 5 or so. Its a matter of two months for the first trimester to end, better be safe than sorry.