2 months late (Technically)?

Alright so in November I was supposed to get a period... I'm a regular, 28 day cycle, 5 day period, heavy cramper, and the usual PMS symptoms 4 - 7 days before my period. Well in November I got no PMS... only spotted lightly because for less than 2 days (light enough to where I didn't wear anything) and now my period was supposed to start 3 days ago... still no sign of AF or PMS.. I've taken a bunch of pregnancy tests and only got vvvvvfaint lines... and still either getting vvvfl or not at all... I am suspecting I'm pregnant because I've experienced rapid weight gain (109 to 123 in about 2 weeks) I'm waking up nauseous every day, extream fatigue, firm stomach (hurts when I press on it?)

I'm very curious, when did you get a solid BFP? Have you ever experienced this kind of scenario and turned out NOT Pregnant? Just looking for some insight... because I need to know when I should approach the guy I slept with about this... a little worried is all! Thank you