I'm happy but worried at the same time

So my DH and I have been ttc for a little while now, and finally this happens. !!! And although we are extremely happy , I feel a little worried. Because although I've taken a whole bunch of test and they all have started with a very very very faint positive line, and it has progressed into a darker positive live, I have not yet missed my period. I've gotten a full BFP but again my period is supposed to start today, and there's no sign of AF yet but I'm scared I'm gonna wake up in the morning this week and I'm in full blown period mode.. Am I Crazy for thinking like this? here's my test stating from Oct 4 to today , notice how the lines have gotten, darker since 1st pic to last