I’m stressing myself out

So my period is supposed to come on the 16th and I usually always get super nervous that my period won’t come. But me and my bf have had sex 3 times after my last period and we used protection and I always do this thing to make sure it’s not broken by putting water into the comdom.... and it was never broken. But I have nausea and my boobs are kinda sore and my nipples look kinda dark. By bf said not to stress and that we are safe but I just need someone else’s opinion on it.....