need advice

Ok so I have been on birth control for 4 years always had regular periods before the pill and while on it. February 24 I had a depo shot I skipped a period in March then in April had a two week one. In May I had one for three days then four days later I very very lightly bled for two days. I havent had any more birth control of any kind due to the decision ttc. Glow said I should have started my period june 4th its now june 10th. I know its take a while for fertility to return but how long does it take foe periods to return to normal? When should I become worried about the lack of period or should I take a hpt? Sorry for the long post.