Freaking out

So I just had my baby a few months ago... well currently I’m 3 days late on my period.. we’ve been using condoms. There has been a few times where we’ve started without one (the last time was 1-2 weeks ago) but we always finish with one on! I’ve had 2 period since I’ve had my baby both with PMS symptoms as they approached (bloating, irritated, pimples on my chin) but as this one was supposed to approach. I noticed no pms symptoms. Now I’m just tired with slight headaches. I’ve taken a test this morning but it was negative but I’m sure if I was pregnant I wouldn’t be far enough along to test positive. THOUGHTS! I’m kinda freaking out!