Needing understanding I’m lost

So hubby and I have been trying to conceive for quite some time it has be very stressful and disappointing to say the very least I think with everything that’s happening I’ve become more and more depressed last few months something weird happened so before 3 weeks ago I hadn’t had my period since January 30 I never had any

Changes in my cycle before it always come around the same Time I tracked it as usual well when the second week of March came I went to see my OB she did a blood test a ultra sound and every thing came back negative everything thing was in tact on the ultrasound no surprises she then stated I should take progesterone to that it could give my period a helping had on March 31st my period came for 3 weeks I so confuse I’m lost I don’t know what’s happening to my body I convinced my self I could have been pregnant someone help me understand.....what’s wrong with me