I've been experiencing the worse neck pain for the past week

I've been experiencing the worse neck pain for the past week. Today I was due for my monthly flow and nothing came so I decided to take a pt. I just knew it was going to be negative because I've been ttc since 2015 with miscarriages back to back and then not get pregnant at all. I thought I was infertile because my 6month old son passed away in 2015 and I told myself I would never be blessed to get pregnant again. But sure enough this morning I got a BFP!!! I almost couldn't breathe I'm still too scared to tell my husband but I'm worried that I'll just miscarry. I've decided to wait until April 1st to tell him.