TTC for 2 months, my period late, need advice

So my husband and I had a miscarriage 5 years ago and we just started TTC 2 months ago. I used to have a slightly irregular cycle before I used BC pill, last month was normal, but now I'm 5 days late. I've been taking my prenatal vitamins every morning and tracking my symptoms daily. I took a test last Wednesday and it was negative.
I just started having cramps, but I can't tell if it's pms or not. I've had a migraine all week last week so I know my body is experiencing a big hormonal change. I don't know when I should take a second test. I've also felt nauseous and extremely irritable and constipated.