frustrated!!!

I hadn't had a period since January after stopping Seasonique (after 7 years of consistently taking it...).. but last night I started & I was so excited! Woke up this morning & it was very light & then stopped around mid-afternoon. Get home tonight from my friends & it's back but very light again... should I be worried or is this normal? It's so hard watching other people in my life get pregnant & I can't help but be a little jealous..